$AOS
A O Smith Corp Stock $aos

$aos Overview Financials Valuation SEC Filings Company Website

2018 Q4 Form 10-K Financial Statement

#000119312519042339 Filed on February 15, 2019

Income Statement

Concept	2018 Q4	2018 Q3	2018 Q2
Revenue	$812.5M	$754.1M	$833.3M
YoY Change	5.71%	0.56%	12.88%
Cost Of Revenue	$475.5M	$448.1M	$492.3M
YoY Change	6.54%	0.72%	13.43%
Gross Profit	$337.0M	$306.0M	$341.0M
YoY Change	4.56%	0.33%	12.1%
Gross Profit Margin	41.48%	40.58%	40.92%
Selling, General & Admin	$186.1M	$177.6M	$197.2M
YoY Change	0.87%	0.45%	10.6%
% of Gross Profit	55.22%	58.04%	57.83%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$18.70M	$17.80M	$17.50M
YoY Change	2.75%	1.14%	0.57%
% of Gross Profit	5.55%	5.82%	5.13%
Operating Expenses	$180.4M	$177.6M	$197.2M
YoY Change	1.01%	0.45%	10.6%
Operating Profit	$156.6M	$144.7M	$159.6M
YoY Change	8.98%	0.49%	12.71%
Interest Expense	-$1.800M	$2.000M	$2.300M
YoY Change	-37.93%	-20.0%	-8.0%
% of Operating Profit	-1.15%	1.38%	1.44%
Other Income/Expense, Net		$5.100M	$4.600M
YoY Change		-13.56%	0.0%
Pretax Income	$154.8M	$131.5M	$146.1M
YoY Change	9.94%	-0.08%	14.14%
Income Tax	$28.50M	$26.90M	$31.60M
% Of Pretax Income	18.41%	20.46%	21.63%
Net Earnings	$126.3M	$104.6M	$114.5M
YoY Change	456.39%	11.63%	23.92%
Net Earnings / Revenue	15.54%	13.87%	13.74%
Basic Earnings Per Share	$0.75	$0.61	$0.67
Diluted Earnings Per Share	$0.74	$0.61	$0.66
COMMON SHARES
Basic Shares Outstanding		170.5M shares	171.1M shares
Diluted Shares Outstanding		172.1M shares	172.7M shares

Balance Sheet

Concept	2018 Q4	2018 Q3	2018 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$645.0M	$617.8M	$658.4M
YoY Change	-21.34%	-19.55%	-11.14%
Cash & Equivalents	$259.7M	$233.0M	$260.0M
Short-Term Investments	$385.3M	$384.8M	$398.4M
Other Short-Term Assets	$41.50M	$66.60M	$61.90M
YoY Change	-27.45%	30.59%	35.75%
Inventory	$304.7M	$307.7M	$289.0M
Prepaid Expenses
Receivables	$647.3M	$606.6M	$644.0M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$1.639B	$1.599B	$1.653B
YoY Change	-7.27%	-5.85%	0.79%
LONG-TERM ASSETS
Property, Plant & Equipment	$540.0M	$526.3M	$532.8M
YoY Change	2.1%	4.9%	11.98%
Goodwill	$513.0M	$515.2M	$514.7M
YoY Change	-0.72%	-0.21%	4.38%
Intangibles	$293.1M	$297.4M	$300.8M
YoY Change	-5.05%	-4.77%	-0.5%
Long-Term Investments
YoY Change
Other Assets	$86.90M	$87.60M	$83.70M
YoY Change	14.04%	14.96%	15.45%
Total Long-Term Assets	$1.433B	$1.427B	$1.432B
YoY Change	0.17%	1.42%	6.57%
TOTAL ASSETS
Total Short-Term Assets	$1.639B	$1.599B	$1.653B
Total Long-Term Assets	$1.433B	$1.427B	$1.432B
Total Assets	$3.072B	$3.025B	$3.085B
YoY Change	-3.94%	-2.56%	3.39%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$543.8M	$508.0M	$532.8M
YoY Change	1.64%	1.58%	8.05%
Accrued Expenses	$120.4M	$111.9M	$116.3M
YoY Change	3.79%	12.24%	27.1%
Deferred Revenue	$47.00M
YoY Change	-16.07%
Short-Term Debt	$0.00	$0.00	$0.00
YoY Change
Long-Term Debt Due	$0.00	$0.00	$2.700M
YoY Change	-100.0%	-100.0%	-63.51%
Total Short-Term Liabilities	$785.3M	$738.9M	$768.7M
YoY Change	-1.07%	0.98%	8.91%
LONG-TERM LIABILITIES
Long-Term Debt	$221.4M	$193.3M	$245.4M
YoY Change	-45.05%	-56.29%	-33.26%
Other Long-Term Liabilities	$298.4M	$312.0M	$306.6M
YoY Change	42.23%	56.94%	58.04%
Total Long-Term Liabilities	$519.8M	$505.3M	$552.0M
YoY Change	-15.16%	-21.17%	-1.73%
TOTAL LIABILITIES
Total Short-Term Liabilities	$785.3M	$738.9M	$768.7M
Total Long-Term Liabilities	$519.8M	$505.3M	$552.0M
Total Liabilities	$1.355B	$1.269B	$1.355B
YoY Change	-12.75%	-11.8%	-1.12%
SHAREHOLDERS EQUITY
Retained Earnings	$2.103B	$2.014B	$1.940B
YoY Change	17.56%	12.26%	12.5%
Common Stock	$661.2M	$660.3M	$658.7M
YoY Change	1.57%	1.55%	1.51%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$827.2M	$730.9M	$695.1M
YoY Change	32.04%	24.49%	26.34%
Treasury Stock Shares
Shareholders Equity	$1.717B	$1.756B	$1.730B
YoY Change
Total Liabilities & Shareholders Equity	$3.072B	$3.025B	$3.085B
YoY Change	-3.94%	-2.56%	3.39%

Cashflow Statement

Concept	2018 Q4	2018 Q3	2018 Q2
OPERATING ACTIVITIES
Net Income	$126.3M	$104.6M	$114.5M
YoY Change	456.39%	11.63%	23.92%
Depreciation, Depletion And Amortization	$18.70M	$17.80M	$17.50M
YoY Change	2.75%	1.14%	0.57%
Cash From Operating Activities	$159.7M	$116.0M	$130.0M
YoY Change	-9.36%	50.65%	53.48%
INVESTING ACTIVITIES
Capital Expenditures	-$26.70M	-$19.00M	-$22.20M
YoY Change	-3.96%	-36.88%	13.85%
Acquisitions
YoY Change
Other Investing Activities	-$400.0K	-$700.0K	$21.40M
YoY Change	-97.87%	-98.45%	1683.33%
Cash From Investing Activities	-$27.10M	-$19.70M	-$800.0K
YoY Change	-41.85%	-73.84%	-95.63%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-105.9M	-123.3M	-111.1M
YoY Change	0.95%	-1006.62%	108.83%
NET CHANGE
Cash From Operating Activities	159.7M	116.0M	130.0M
Cash From Investing Activities	-27.10M	-19.70M	-800.0K
Cash From Financing Activities	-105.9M	-123.3M	-111.1M
Net Change In Cash	26.70M	-27.00M	18.10M
YoY Change	8.1%	-276.47%	37.12%
FREE CASH FLOW
Cash From Operating Activities	$159.7M	$116.0M	$130.0M
Capital Expenditures	-$26.70M	-$19.00M	-$22.20M
Free Cash Flow	$186.4M	$135.0M	$152.2M
YoY Change	-8.63%	26.05%	46.07%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
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CY2017Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	346600000
CY2018Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	385300000
CY2017Q4	us-gaap	Marketable Securities Current MarketableSecuritiesCurrent	473400000
CY2018Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	647300000
CY2017Q4	us-gaap	Receivables Net Current ReceivablesNetCurrent	592700000
CY2017	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	52700000
CY2018Q4	us-gaap	Other Assets Current OtherAssetsCurrent	41500000
CY2017Q4	us-gaap	Other Assets Current OtherAssetsCurrent	57200000
CY2018Q4	us-gaap	Assets Current AssetsCurrent	1638500000
CY2017Q4	us-gaap	Assets Current AssetsCurrent	1766900000
CY2018Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	86900000
CY2017Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	76200000
CY2018Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	543800000
CY2017Q4	us-gaap	Accounts Payable Trade Current AccountsPayableTradeCurrent	535000000
CY2018Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	79400000
CY2017Q4	us-gaap	Employee Related Liabilities Current EmployeeRelatedLiabilitiesCurrent	90800000
CY2018Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	120400000
CY2017Q4	us-gaap	Accrued Liabilities Current AccruedLiabilitiesCurrent	116000000
CY2018Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	41700000
CY2017Q4	us-gaap	Product Warranty Accrual Classified Current ProductWarrantyAccrualClassifiedCurrent	44500000
CY2018Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	0
CY2018Q4	us-gaap	Liabilities Current LiabilitiesCurrent	785300000
CY2017Q4	us-gaap	Liabilities Current LiabilitiesCurrent	793800000
CY2018Q4	us-gaap	Product Warranty Accrual Noncurrent ProductWarrantyAccrualNoncurrent	97700000
CY2017Q4	us-gaap	Product Warranty Accrual Noncurrent ProductWarrantyAccrualNoncurrent	97900000
CY2018Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	49400000
CY2017Q4	us-gaap	Defined Benefit Pension Plan Liabilities Noncurrent DefinedBenefitPensionPlanLiabilitiesNoncurrent	48100000
CY2018Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	200700000
CY2017Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	209800000
CY2018Q4	us-gaap	Liabilities Liabilities	1354500000
CY2017Q4	us-gaap	Liabilities Liabilities	1552500000
CY2018Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2017Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies
CY2018Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2017Q4	us-gaap	Preferred Stock Value PreferredStockValue
CY2018Q4	us-gaap	Common Stock Value CommonStockValue	164500000
CY2017Q4	us-gaap	Common Stock Value CommonStockValue	164500000
CY2018Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	496700000
CY2017Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	486500000
CY2018Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	2102800000
CY2017Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1788700000
CY2018Q4	us-gaap	Treasury Stock Value TreasuryStockValue	827200000
CY2017Q4	us-gaap	Treasury Stock Value TreasuryStockValue	626500000
CY2018Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3071500000
CY2017Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	3197400000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	113600000
CY2017	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	224300000
CY2016	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	136000000
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	2.60
CY2017	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.72
CY2016	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.87
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	2.58
CY2017	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2016	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.85
CY2018	us-gaap	Net Income Loss NetIncomeLoss	444200000
CY2017	us-gaap	Net Income Loss NetIncomeLoss	296500000
CY2016	us-gaap	Net Income Loss NetIncomeLoss	326500000
CY2018	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-38400000
CY2016	us-gaap	Other Comprehensive Income Loss Foreign Currency Transaction And Translation Adjustment Net Of Tax OtherComprehensiveIncomeLossForeignCurrencyTransactionAndTranslationAdjustmentNetOfTax	-39800000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-12100000
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	200000
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1100000
CY2016	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-139600000
CY2016	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Net Of Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodNetOfTax	-1000000
CY2018	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	13100000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	9000000
CY2018	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	392900000
CY2017	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	360200000
CY2016	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	276700000
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CY2016	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	65100000
CY2018	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	0
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	10100000
CY2017	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9900000
CY2016	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	9400000
CY2018	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	40000000
CY2017	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	127800000
CY2016	us-gaap	Increase Decrease In Other Current Assets And Liabilities Net IncreaseDecreaseInOtherCurrentAssetsAndLiabilitiesNet	-68500000
CY2018	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	37300000
CY2017	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	4100000
CY2016	us-gaap	Increase Decrease In Other Noncurrent Assets And Liabilities Net IncreaseDecreaseInOtherNoncurrentAssetsAndLiabilitiesNet	22900000
CY2018	us-gaap	Proceeds From Repayments Of Debt ProceedsFromRepaymentsOfDebt	-189000000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	448900000
CY2017	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	326400000
CY2016	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	446600000
CY2018	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	0
CY2017	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	43100000
CY2018	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	523400000
CY2017	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	583500000
CY2016	us-gaap	Payments To Acquire Marketable Securities PaymentsToAcquireMarketableSecurities	563800000
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CY2018	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	85200000
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	94200000
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	80700000
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-12700000
CY2017	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-158100000
CY2016	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-300200000
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CY2018	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	202600000
CY2017	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	139100000
CY2016	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	135200000
CY2018	aos	Proceeds From Stock Options Activity ProceedsFromStockOptionsActivity	900000
CY2017	aos	Proceeds From Stock Options Activity ProceedsFromStockOptionsActivity	-900000
CY2016	aos	Proceeds From Stock Options Activity ProceedsFromStockOptionsActivity	5700000
CY2018	aos	Business Combination Contingent Consideration Paid BusinessCombinationContingentConsiderationPaid	2300000
CY2018	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	130100000
CY2017	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	96900000
CY2016	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	84200000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-523100000
CY2017	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-152100000
CY2018Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	139400000
CY2018	us-gaap	Advertising Expense AdvertisingExpense	132100000
CY2016	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	4500000
CY2018	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	-86900000
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CY2016	us-gaap	Cash And Cash Equivalents Period Increase Decrease CashAndCashEquivalentsPeriodIncreaseDecrease	6800000
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CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	1717000000
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CY2018Q4	us-gaap	Notes Payable NotesPayable	120000000
CY2017Q4	us-gaap	Notes Payable NotesPayable	127500000
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CY2017Q4	us-gaap	Product Warranty Accrual ProductWarrantyAccrual	141200000
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CY2018	us-gaap	Product Warranty Expense ProductWarrantyExpense	40700000
CY2017	us-gaap	Product Warranty Expense ProductWarrantyExpense	39700000
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CY2017	us-gaap	Product Warranty Accrual Payments ProductWarrantyAccrualPayments	39400000
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CY2018Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	293100000
CY2017	us-gaap	Advertising Expense AdvertisingExpense	126900000
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CY2018	aos	Amortization Of Advertising Costs AmortizationOfAdvertisingCosts	38700000
CY2017	aos	Amortization Of Advertising Costs AmortizationOfAdvertisingCosts	43000000
CY2016	aos	Amortization Of Advertising Costs AmortizationOfAdvertisingCosts	37000000
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	94000000
CY2017	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	86400000
CY2016	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	80100000
CY2018	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	2400000
CY2017	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	11600000
CY2016	us-gaap	Excess Tax Benefit From Share Based Compensation Financing Activities ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	5900000
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CY2017	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	172666056
CY2016	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	174712683
CY2018	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1604695
CY2017	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	1939133
CY2016	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2112597
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	172194040
CY2017	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	174605189
CY2016	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	176825280
CY2018	aos	Percentage Of Stock Dividend To Stock Holders PercentageOfStockDividendToStockHolders	1
CY2018	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	400000
CY2017	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	300000
CY2016	us-gaap	Effect Of Lifo Inventory Liquidation On Income EffectOfLIFOInventoryLiquidationOnIncome	-300000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	240500000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	111500000
CY2018Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	129000000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	239500000
CY2017Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	96000000
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y8M12D
CY2018	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	4400000
CY2016	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	117400000
CY2018	us-gaap	Debt Instrument Periodic Payment Interest DebtInstrumentPeriodicPaymentInterest	8600000
CY2017	us-gaap	Debt Instrument Periodic Payment Interest DebtInstrumentPeriodicPaymentInterest	10000000
CY2017	us-gaap	Stock Option Plan Expense StockOptionPlanExpense	4700000
CY2017Q4	us-gaap	Intangible Assets Gross Excluding Goodwill IntangibleAssetsGrossExcludingGoodwill	404700000
CY2017Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	308700000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	14300000
CY2017	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13700000
CY2016	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	13400000
CY2018	us-gaap	Acquired Finite Lived Intangible Assets Weighted Average Useful Life AcquiredFiniteLivedIntangibleAssetsWeightedAverageUsefulLife	P12Y
CY2016Q4	us-gaap	Line Of Credit Facility Current Borrowing Capacity LineOfCreditFacilityCurrentBorrowingCapacity	500000000
CY2016Q4	us-gaap	Line Of Credit Facility Maximum Borrowing Capacity LineOfCreditFacilityMaximumBorrowingCapacity	700000000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	6800000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	108200000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	6800000
CY2018Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	10000000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	14800000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	11400000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	8600000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	7500000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	3500000
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	23300000
CY2018	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	24000000
CY2017	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	23900000
CY2016	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	22400000
CY2016	us-gaap	Debt Instrument Periodic Payment Interest DebtInstrumentPeriodicPaymentInterest	7200000
CY2018	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	400000
CY2017	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	700000
CY2016	us-gaap	Interest Costs Capitalized InterestCostsCapitalized	200000
CY2018Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	1
CY2018Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	240000000
CY2018Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	1
CY2018	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.76
CY2017	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.56
CY2016	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.48
CY2018Q3	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	2500000
CY2018	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	3797800
CY2018Q4	us-gaap	Stock Repurchase Program Remaining Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramRemainingNumberOfSharesAuthorizedToBeRepurchased	6075253
CY2017	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	2533350
CY2017	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	139100000
CY2016	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	3273109
CY2016	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	135200000
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-64900000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Foreign Currency Translation Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossForeignCurrencyTranslationAdjustmentNetOfTax	-26500000
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-700000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-900000
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	285200000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	272100000
CY2018Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-350800000
CY2017Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-299500000
CY2016	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-1200000
CY2015	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P5Y9M18D
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.029
CY2017	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2016	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2018	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.024
CY2018Q4	aos	Defined Benefit Plan Fair Value Of Plan Assets Including Noninvestment Plan Assets DefinedBenefitPlanFairValueOfPlanAssetsIncludingNoninvestmentPlanAssets	777500000
CY2017	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.019
CY2018	aos	Cash And Cash Equivalents And Marketable Securities Were Held By Foreign Subsidiaries CashAndCashEquivalentsAndMarketableSecuritiesWereHeldByForeignSubsidiaries	644100000
CY2018Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0600
CY2017Q4	us-gaap	Defined Benefit Plan Health Care Cost Trend Rate Assumed Next Fiscal Year DefinedBenefitPlanHealthCareCostTrendRateAssumedNextFiscalYear	0.0650
CY2018Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2017Q4	us-gaap	Defined Benefit Plan Ultimate Health Care Cost Trend Rate1 DefinedBenefitPlanUltimateHealthCareCostTrendRate1	0.0500
CY2018Q4	aos	Defined Benefit Plan Fair Value Of Non Investment Plan Assets DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets	2200000
CY2016	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	11000000
CY2018	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	1500000
CY2017	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5800000
CY2016	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	5200000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-500000
CY2017	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-6200000
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CY2015	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.277
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CY2018	aos	Percentage Match Of Next Five Percent Of Contributions Made By Participating Employees PercentageMatchOfNextFivePercentOfContributionsMadeByParticipatingEmployees	0.5
CY2018Q4	us-gaap	Defined Benefit Plan Accumulated Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
CY2018	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets
CY2017	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets
CY2016	us-gaap	Defined Benefit Plan Expected Return On Plan Assets DefinedBenefitPlanExpectedReturnOnPlanAssets
CY2018	us-gaap	Defined Benefit Plan Amortization Of Gains Losses DefinedBenefitPlanAmortizationOfGainsLosses
CY2018	us-gaap	Defined Benefit Plan Net Periodic Benefit Cost DefinedBenefitPlanNetPeriodicBenefitCost
CY2018	aos	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Loss Amortization Of Net Gain Loss Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeLossAmortizationOfNetGainLossBeforeTax
CY2018	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
CY2017	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
CY2016	us-gaap	Defined Benefit Plan Amounts Recognized In Other Comprehensive Income Net Prior Service Cost Credit Before Tax DefinedBenefitPlanAmountsRecognizedInOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
CY2017Q4	aos	Defined Benefit Plan Fair Value Of Non Investment Plan Assets DefinedBenefitPlanFairValueOfNonInvestmentPlanAssets	1000000
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CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	700000
CY2017	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Before Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodBeforeTax	-600000
CY2018	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	600000
CY2017	us-gaap	Derivative Instruments Gain Loss Reclassified From Accumulated Oci Into Income Effective Portion Net DerivativeInstrumentsGainLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortionNet	1000000
CY2018	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	60100000
CY2017	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	148000000
CY2016	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	71600000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	15600000
CY2017	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	9400000
CY2016	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	14500000
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	38600000
CY2017	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	43800000
CY2016	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	34900000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-1700000
CY2017	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	23500000
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	32500000
CY2017Q4	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Undistributed Foreign Earnings Provisional Income Tax Expense TaxCutsAndJobsActOf2017IncompleteAccountingUndistributedForeignEarningsProvisionalIncomeTaxExpense	83500000
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CY2018Q4	aos	Deferred Tax Assets Undistributed Foreign Earnings DeferredTaxAssetsUndistributedForeignEarnings
CY2018Q4	aos	Deferred Tax Liabilities Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
CY2017	us-gaap	Valuation Allowances And Reserves Deductions ValuationAllowancesAndReservesDeductions
CY2018Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	28900000
CY2018Q4	aos	Net Operating Losses And Tax Credits NetOperatingLossesAndTaxCredits	17500000
CY2017Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	30400000
CY2017Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	6200000
CY2017Q4	aos	Deferred Tax Liabilities Tax Deferred Expense Compensation And Benefits Employee Compensation DeferredTaxLiabilitiesTaxDeferredExpenseCompensationAndBenefitsEmployeeCompensation
CY2018Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsWarrantyReserves	42500000
CY2018Q4	aos	Deferred Tax Liabilities Tax Deferred Expense Reserves And Accruals Warranty Reserves DeferredTaxLiabilitiesTaxDeferredExpenseReservesAndAccrualsWarrantyReserves
CY2016Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	4200000
CY2018	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2100000
CY2017	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	2000000
CY2016	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.028
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.014
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits EffectiveIncomeTaxRateReconciliationTaxCredits	0.015
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.005
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.003
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Tax Credits Research EffectiveIncomeTaxRateReconciliationTaxCreditsResearch	0.003
CY2018	aos	Effective Income Tax Rate Reconciliation Excess Tax Benefits Relating To Stock Based Compensation EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation	0.004
CY2017	aos	Effective Income Tax Rate Reconciliation Excess Tax Benefits Relating To Stock Based Compensation EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation	0.022
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.009
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.008
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.004
CY2018	aos	Effective Income Tax Rate Continuing Operations Excluding Change In Tax Rate EffectiveIncomeTaxRateContinuingOperationsExcludingChangeInTaxRate	0.204
CY2017	aos	Effective Income Tax Rate Continuing Operations Excluding Change In Tax Rate EffectiveIncomeTaxRateContinuingOperationsExcludingChangeInTaxRate	0.274
CY2016	aos	Effective Income Tax Rate Continuing Operations Excluding Change In Tax Rate EffectiveIncomeTaxRateContinuingOperationsExcludingChangeInTaxRate	0.294
CY2018	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.204
CY2017	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.431
CY2016	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.294
CY2018	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.21
CY2017Q4	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	81800000
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CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	329900000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	300900000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	181800000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	190900000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	161600000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	557800000
CY2017	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	520800000
CY2016	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	462500000
CY2018	us-gaap	Income Taxes Paid Net IncomeTaxesPaidNet	116400000
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CY2017Q4	aos	Deferred Tax Assets Undistributed Foreign Earnings DeferredTaxAssetsUndistributedForeignEarnings
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	8300000
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CY2018Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory
CY2018Q4	aos	Deferred Tax Liabilities Inventories DeferredTaxLiabilitiesInventories	600000
CY2017Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory
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CY2018Q4	aos	Deferred Tax Assets Accounts Receivable DeferredTaxAssetsAccountsReceivable	18300000
CY2018Q4	aos	Deferred Tax Liabilities Accounts Receivable DeferredTaxLiabilitiesAccountsReceivable
CY2017Q4	aos	Deferred Tax Assets Accounts Receivable DeferredTaxAssetsAccountsReceivable	16500000
CY2017Q4	aos	Deferred Tax Liabilities Accounts Receivable DeferredTaxLiabilitiesAccountsReceivable
CY2018Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment
CY2018Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	36300000
CY2017Q4	us-gaap	Deferred Tax Assets Property Plant And Equipment DeferredTaxAssetsPropertyPlantAndEquipment
CY2017Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	31100000
CY2018Q4	aos	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets
CY2018Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	57300000
CY2017Q4	aos	Deferred Tax Assets Goodwill And Intangible Assets Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssetsIntangibleAssets
CY2017Q4	us-gaap	Deferred Tax Liabilities Goodwill And Intangible Assets Intangible Assets DeferredTaxLiabilitiesGoodwillAndIntangibleAssetsIntangibleAssets	54300000
CY2018Q4	aos	Deferred Tax Asset Environmental DeferredTaxAssetEnvironmental	2100000
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CY2018Q4	aos	Deferred Tax Asset Tax Loss And Credit Carryovers DeferredTaxAssetTaxLossAndCreditCarryovers	17500000
CY2018Q4	aos	Deferred Tax Liability Tax Loss And Credit Carryovers DeferredTaxLiabilityTaxLossAndCreditCarryovers
CY2017Q4	aos	Deferred Tax Asset Tax Loss And Credit Carryovers DeferredTaxAssetTaxLossAndCreditCarryovers	19800000
CY2017Q4	aos	Deferred Tax Liability Tax Loss And Credit Carryovers DeferredTaxLiabilityTaxLossAndCreditCarryovers
CY2018Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	4000000
CY2018Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther
CY2017Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	5500000
CY2017Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther
CY2018Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	13100000
CY2018Q4	aos	Deferred Tax Liabilities Valuation Allowance DeferredTaxLiabilitiesValuationAllowance
CY2017Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	15000000
CY2017Q4	aos	Deferred Tax Liabilities Valuation Allowance DeferredTaxLiabilitiesValuationAllowance
CY2018Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	103800000
CY2018Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	123100000
CY2017Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	126000000
CY2018Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	19300000
CY2017Q4	aos	Net Operating Losses And Tax Credits NetOperatingLossesAndTaxCredits	19800000
CY2016Q4	aos	Net Operating Losses And Tax Credits NetOperatingLossesAndTaxCredits	18200000
CY2018	aos	Net Operating Losses And Tax Credits Additions NetOperatingLossesAndTaxCreditsAdditions
CY2017	aos	Net Operating Losses And Tax Credits Additions NetOperatingLossesAndTaxCreditsAdditions	1600000
CY2018	us-gaap	Valuation Allowances And Reserves Reserves Of Businesses Acquired ValuationAllowancesAndReservesReservesOfBusinessesAcquired
CY2017	aos	Net Operating Losses And Tax Credits Deductions NetOperatingLossesAndTaxCreditsDeductions
CY2017Q2	us-gaap	Gross Profit GrossProfit	304200000
CY2017	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-7500000
CY2016	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	5700000
CY2017Q4	aos	Product Liability Individual Claim Maximum Amount ProductLiabilityIndividualClaimMaximumAmount	7500000
CY2018Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2018Q1	us-gaap	Gross Profit GrossProfit	321500000
CY2017Q1	us-gaap	Gross Profit GrossProfit	300900000
CY2018Q2	us-gaap	Gross Profit GrossProfit	341000000
CY2018	us-gaap	Operating Income Loss OperatingIncomeLoss	613400000
CY2017	us-gaap	Operating Income Loss OperatingIncomeLoss	577900000
CY2016	us-gaap	Operating Income Loss OperatingIncomeLoss	515000000
CY2018	us-gaap	Interest Expense InterestExpense	8400000
CY2017	us-gaap	Interest Expense InterestExpense	10100000
CY2016	us-gaap	Interest Expense InterestExpense	7300000
CY2018Q4	us-gaap	Assets Assets	3071500000
CY2017Q4	us-gaap	Assets Assets	3197400000
CY2016Q4	us-gaap	Assets Assets	2891000000
CY2017	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	94200000
CY2016	us-gaap	Payments To Acquire Productive Assets PaymentsToAcquireProductiveAssets	80700000
CY2018Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	788000000
CY2017Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	740000000
CY2018Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	833300000
CY2017Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	738200000
CY2018Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	754100000
CY2017Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	749900000
CY2018Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	812500000
CY2017Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	768600000
CY2018Q3	us-gaap	Gross Profit GrossProfit	306000000
CY2017Q3	us-gaap	Gross Profit GrossProfit	305000000
CY2018Q4	us-gaap	Gross Profit GrossProfit	337000000
CY2017Q4	us-gaap	Gross Profit GrossProfit	322300000
CY2018Q1	us-gaap	Net Income Loss NetIncomeLoss	98800000
CY2017Q1	us-gaap	Net Income Loss NetIncomeLoss	87700000
CY2018Q2	us-gaap	Net Income Loss NetIncomeLoss	114500000
CY2017Q2	us-gaap	Net Income Loss NetIncomeLoss	92400000
CY2018Q3	us-gaap	Net Income Loss NetIncomeLoss	104600000
CY2017Q3	us-gaap	Net Income Loss NetIncomeLoss	93700000
CY2018Q4	us-gaap	Net Income Loss NetIncomeLoss	126300000
CY2017Q4	us-gaap	Net Income Loss NetIncomeLoss	22700000
CY2018Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.58
CY2017Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.51
CY2018Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.67
CY2017Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.53
CY2018Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.61
CY2017Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.54
CY2018Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2017Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.13
CY2018Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.57
CY2017Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.50
CY2018Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2017Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.53
CY2018Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.61
CY2017Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.54
CY2018Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.74
CY2017Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.13
CY2018Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2017Q1	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2017Q2	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2018Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.18
CY2017Q3	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2018Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.22
CY2017Q4	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.14
CY2018Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	164516267
CY2017Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	164468033
CY2018	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-100000
CY2018	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2017	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-5100000
CY2017	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	81800000
CY2016	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	0
CY2017	aos	Business Combination Contingent Consideration Paid BusinessCombinationContingentConsiderationPaid	1700000
CY2016	aos	Business Combination Contingent Consideration Paid BusinessCombinationContingentConsiderationPaid	0
CY2018	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family: "times new roman", serif; font-size: 10pt; color: rgb(0, 0, 0); letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">Use of estimates</div></div><div style="font-family: "times new roman", serif; font-size: 10pt; color: rgb(0, 0, 0); letter-spacing: 0px; top: 0px;;display:inline;">. The preparation of financial statements in conformity with accounting principles generally accepted in the United States (U.S.) requires management to make estimates and assumptions that affect the amounts reported in the accompanying financial statements and notes. Actual results could differ from those estimates. </div><table border="0" style="width:100%; table-layout:fixed;" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>
CY2016	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	101500000
CY2017	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2018Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	47000000
CY2017Q4	us-gaap	Contract With Customer Liability Current ContractWithCustomerLiabilityCurrent	56000000
CY2018Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	6400000
CY2017Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	5300000
CY2018	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2018	us-gaap	Prior Period Reclassification Adjustment Description PriorPeriodReclassificationAdjustmentDescription	<div style="font-family: "times new roman", serif; font-size: 10pt; color: rgb(0, 0, 0); letter-spacing: 0px; top: 0px;;display:inline;"><div style="font-weight:bold;display:inline;">Reclassifications. </div></div><div style="font-family: "times new roman", serif; font-size: 10pt; color: rgb(0, 0, 0); letter-spacing: 0px; top: 0px;;display:inline;">Certain amounts from prior years have been reclassified to conform with current year presentation. </div><table border="0" style="width:100%; table-layout:fixed;" cellspacing="0" cellpadding="0"><tr><td></td></tr></table>
CY2018	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	-3500000
CY2018Q1	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefit	6700000
CY2017Q4	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit Reduction In Earning Per Share TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefitReductionInEarningPerShare	0.47
CY2018	us-gaap	Restructuring Settlement And Impairment Provisions RestructuringSettlementAndImpairmentProvisions	6700000
CY2017	us-gaap	Income Tax Reconciliation Repatriation Of Foreign Earnings IncomeTaxReconciliationRepatriationOfForeignEarnings	81800000
CY2018	aos	Maximum Aggregate Product Liability Insurance Coverage MaximumAggregateProductLiabilityInsuranceCoverage	125000000
CY2018Q4	aos	Product Liability Individual Claim Maximum Amount ProductLiabilityIndividualClaimMaximumAmount	7500000
CY2017	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	37500000
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	37.23
CY2016	aos	Effective Income Tax Rate Reconciliation Excess Tax Benefits Relating To Stock Based Compensation EffectiveIncomeTaxRateReconciliationExcessTaxBenefitsRelatingToStockBasedCompensation	0.011
CY2017	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate	0.157
CY2016	us-gaap	Effective Income Tax Rate Reconciliation Change In Enacted Tax Rate EffectiveIncomeTaxRateReconciliationChangeInEnactedTaxRate
CY2017Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	103000000
CY2017Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	23000000
CY2018	aos	Net Operating Losses And Tax Credits Deductions NetOperatingLossesAndTaxCreditsDeductions	2300000
CY2018	aos	Payments For Restructuring And Restructuring Reserve Disposal Adjustment PaymentsForRestructuringAndRestructuringReserveDisposalAdjustment	-5200000
CY2018Q4	us-gaap	Restructuring Reserve RestructuringReserve	1500000
CY2018Q4	us-gaap	Decrease In Unrecognized Tax Benefits Is Reasonably Possible DecreaseInUnrecognizedTaxBenefitsIsReasonablyPossible	0
CY2018Q1	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	6700000
CY2018Q1	us-gaap	Severance Costs1 SeveranceCosts1	4000000
CY2018Q1	us-gaap	Business Exit Costs1 BusinessExitCosts1	2100000
CY2018Q1	us-gaap	Impairment Of Long Lived Assets Held For Use ImpairmentOfLongLivedAssetsHeldForUse	600000
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	54600000
CY2017	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	75800000
CY2016	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	15100000
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	7700000
CY2016	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	23400000
CY2018	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	-10000000
CY2017	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	9000000
CY2016	us-gaap	Increase Decrease In Other Current Assets IncreaseDecreaseInOtherCurrentAssets	3200000
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	8800000
CY2016	us-gaap	Goodwill Impairment Loss GoodwillImpairmentLoss	0
CY2017	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	12200000
CY2016	us-gaap	Increase Decrease In Accrued Liabilities And Other Operating Liabilities IncreaseDecreaseInAccruedLiabilitiesAndOtherOperatingLiabilities	6000000
CY2018	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	7000000
CY2017	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	-12600000
CY2016	us-gaap	Increase Decrease In Income Taxes Payable Net Of Income Taxes Receivable IncreaseDecreaseInIncomeTaxesPayableNetOfIncomeTaxesReceivable	2700000
CY2016Q4	us-gaap	Goodwill Goodwill	491500000
CY2017	us-gaap	Goodwill Acquired During Period GoodwillAcquiredDuringPeriod	22200000
CY2017	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	-3000000
CY2017Q4	us-gaap	Goodwill Goodwill	516700000
CY2018	us-gaap	Goodwill Foreign Currency Translation Gain Loss GoodwillForeignCurrencyTranslationGainLoss	3700000
CY2018Q4	us-gaap	Goodwill Goodwill	513000000
CY2018	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2017	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2016	us-gaap	Impairment Of Intangible Assets Excluding Goodwill ImpairmentOfIntangibleAssetsExcludingGoodwill	0
CY2017Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	7500000
CY2018Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	221400000
CY2017Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	402900000
CY2016	aos	Number Of Banks Involved In Multi Year Multi Currency Revolving Credit Agreement NumberOfBanksInvolvedInMultiYearMultiCurrencyRevolvingCreditAgreement	9
CY2016	us-gaap	Line Of Credit Facility Expiration Date1 LineOfCreditFacilityExpirationDate1	2021-12-15
CY2018Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	69100000
CY2018Q4	aos	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effects Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectsTax	200000
CY2017Q4	aos	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effects Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectsTax	600000
CY2018Q4	aos	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect	180100000
CY2017Q4	aos	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Tax Effect AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansTaxEffect	175900000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	27.73
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	21.69
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	18.03
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	61.62
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	50.16
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	32.25
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	22.93
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	16.93
CY2016	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	14.12
CY2018	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	47.95
CY2017	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	37.46
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	29100000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	13500000
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	358150
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	33.05
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	24.52
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	20.48
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	16.12
CY2017	us-gaap	Defined Benefit Plan Plan Assets Contributions By Plan Participant DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant
CY2018	aos	Postretirement Medical Benefits Qualifying Age PostretirementMedicalBenefitsQualifyingAge	P65Y
CY2018	aos	Other Comprehensive Income Loss Minimum Pension Liability Net Adjustment Tax Effect OtherComprehensiveIncomeLossMinimumPensionLiabilityNetAdjustmentTaxEffect	13100000
CY2017	aos	Other Comprehensive Income Loss Minimum Pension Liability Net Adjustment Tax Effect OtherComprehensiveIncomeLossMinimumPensionLiabilityNetAdjustmentTaxEffect	12100000
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	202600000
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2263126
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2664333
CY2015Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2653558
CY2018	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	176302
CY2017	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	752603
CY2016	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	531933
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	27355
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	6754
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	10662
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2432689
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1665184
CY2017Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1387259
CY2016Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1602651
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercises In Period Total Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisesInPeriodTotalIntrinsicValue	6800000
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	553370
CY2017	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset
CY2018Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P7Y
CY2018Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	33000000
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y
CY2016	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P6Y
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	31100000
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	875867
CY2017Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	39.21
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares	454653
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue	36.26
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedNumberOfShares	26929
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Options Forfeited Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedOptionsForfeitedWeightedAverageGrantDateFairValue	47.96
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Number Of Shares SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares	767505
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	51.55
CY2016	us-gaap	Payments To Acquire Businesses Net Of Cash Acquired PaymentsToAcquireBusinessesNetOfCashAcquired	90800000
CY2018Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1096800000
CY2017Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1060100000
CY2018Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	556800000
CY2017Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	531200000
CY2018Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	540000000
CY2017Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	528900000
CY2018Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2017Q4	us-gaap	Defined Benefit Plan Weighted Average Asset Allocations DefinedBenefitPlanWeightedAverageAssetAllocations	1
CY2018Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	137600000
CY2017Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	140400000
CY2018Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	23300000
CY2017Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	18300000
CY2018Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	174400000
CY2017Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	160500000
CY2018Q4	us-gaap	Inventory Gross InventoryGross	335300000
CY2017Q4	us-gaap	Inventory Gross InventoryGross	319200000
CY2018Q4	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	30600000
CY2017Q4	us-gaap	Inventory Lifo Reserve InventoryLIFOReserve	22200000
CY2018Q4	us-gaap	Inventory Net InventoryNet	304700000
CY2017Q4	us-gaap	Inventory Net InventoryNet	297000000
CY2018	us-gaap	Defined Benefit Plan Benefit Obligation Contributions By Plan Participant DefinedBenefitPlanBenefitObligationContributionsByPlanParticipant
CY2018	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments
CY2017	us-gaap	Defined Benefit Plan Plan Amendments DefinedBenefitPlanPlanAmendments
CY2016Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets
CY2018	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets
CY2017	us-gaap	Defined Benefit Plan Actual Return On Plan Assets DefinedBenefitPlanActualReturnOnPlanAssets
CY2018	us-gaap	Defined Benefit Plan Plan Assets Contributions By Plan Participant DefinedBenefitPlanPlanAssetsContributionsByPlanParticipant
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	14.80
CY2017	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	13.04
CY2016	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Weighted Average Grant Date Fair Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue	8.03
CY2017	us-gaap	Number Of Reportable Segments NumberOfReportableSegments	2
CY2018Q4	us-gaap	Notes Payable Fair Value Disclosure NotesPayableFairValueDisclosure	120000000
CY2017Q4	us-gaap	Notes Payable Fair Value Disclosure NotesPayableFairValueDisclosure	127500000
CY2016Q4	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	2
CY2016Q3	us-gaap	Stockholders Equity Note Stock Split Conversion Ratio1 StockholdersEquityNoteStockSplitConversionRatio1	2
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	373220
CY2018	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2016-10-05
CY2018	us-gaap	Dividends Payable Date Of Record Day Month And Year DividendsPayableDateOfRecordDayMonthAndYear	2016-09-21
CY2017Q4	us-gaap	Restructuring Reserve RestructuringReserve
CY2018	us-gaap	Gross Profit GrossProfit	1305500000
CY2017	us-gaap	Gross Profit GrossProfit	1232400000
CY2016	us-gaap	Gross Profit GrossProfit	1114200000
CY2018Q1	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit Reduction In After Tax Earnings TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefitReductionInAfterTaxEarnings	5000000
CY2018Q1	aos	Tax Cuts And Jobs Act Of2017 Incomplete Accounting Provisional Income Tax Expense Benefit Reduction In After Tax Earnings Per Share TaxCutsAndJobsActOf2017IncompleteAccountingProvisionalIncomeTaxExpenseBenefitReductionInAfterTaxEarningsPerShare	0.03
CY2017Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	753800000
CY2016	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	662500000
CY2018	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	6700000
CY2016	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0
CY2018	us-gaap	Interest Expense InterestExpense	8400000
CY2016	us-gaap	Interest Expense InterestExpense	7300000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	21200000
CY2016	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	18100000
CY2017	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	722800000
CY2017	us-gaap	Restructuring Costs And Asset Impairment Charges RestructuringCostsAndAssetImpairmentCharges	0
CY2017	us-gaap	Interest Expense InterestExpense	10100000
CY2017	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	21300000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	3187900000
CY2017	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2996700000
CY2016	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	2685900000
CY2018	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1882400000
CY2017	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1764300000
CY2016	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1571700000
CY2018	dei	Document Type DocumentType	10-K
CY2018	dei	Amendment Flag AmendmentFlag	false
CY2018	dei	Document Period End Date DocumentPeriodEndDate	2018-12-31
CY2018	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2018
CY2018	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2018	dei	Entity Registrant Name EntityRegistrantName	SMITH A O CORP
CY2018	dei	Entity Central Index Key EntityCentralIndexKey	0000091142
CY2018	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2018	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2018	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2018	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2018	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2018	dei	Trading Symbol TradingSymbol	AOS
CY2018	dei	Entity Shell Company EntityShellCompany	false
CY2018	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2018	dei	Entity Small Business EntitySmallBusiness	false
CY2018Q4	us-gaap	Long Term Debt LongTermDebt	221400000
CY2017Q4	us-gaap	Long Term Debt LongTermDebt	410400000
CY2018Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	775300000
CY2017Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	873800000
CY2016Q4	us-gaap	Noncurrent Assets NoncurrentAssets	528200000
CY2018	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2021
CY2017	us-gaap	Defined Benefit Plan Year Health Care Cost Trend Rate Reaches Ultimate Trend Rate DefinedBenefitPlanYearHealthCareCostTrendRateReachesUltimateTrendRate	2021
CY2018Q4	us-gaap	Stock Repurchase Program Number Of Shares Authorized To Be Repurchased StockRepurchaseProgramNumberOfSharesAuthorizedToBeRepurchased	5000000
CY2018Q4	us-gaap	Noncurrent Assets NoncurrentAssets	625900000
CY2017Q4	us-gaap	Noncurrent Assets NoncurrentAssets	604100000
CY2018Q4	us-gaap	Operating Lease Right Of Use Asset OperatingLeaseRightOfUseAsset	55000000

Files In Submission

Name	View Source	Status
0001193125-19-042339-index-headers.html	Edgar Link	pending
0001193125-19-042339-index.html	Edgar Link	pending
0001193125-19-042339.txt	Edgar Link	pending
0001193125-19-042339-xbrl.zip	Edgar Link	pending
aos-20181231.xml	Edgar Link	completed
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aos-20181231_def.xml	Edgar Link	unprocessable
aos-20181231_lab.xml	Edgar Link	unprocessable
aos-20181231_pre.xml	Edgar Link	unprocessable
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Financial_Report.xlsx	Edgar Link	pending
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2018 Q4 Form 10-K Financial Statement

#000119312519042339 Filed on February 15, 2019

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Facts In Submission

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$AOS A O Smith Corp Stock $aos

2018 Q4 Form 10-K Financial Statement

#000119312519042339 Filed on February 15, 2019

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$AOS
A O Smith Corp Stock $aos