$MTUS
Metallus Inc. Stock $mtus

$mtus Overview Financials Valuation SEC Filings Company Website

2020 Q4 Form 10-K Financial Statement

#000156459021008896 Filed on February 25, 2021

Income Statement

Concept	2020 Q4	2020 Q3	2020 Q2
Revenue	$211.2M	$205.9M	$154.0M
YoY Change	-6.92%	-24.91%	-54.26%
Cost Of Revenue	$197.0M	$208.3M	$158.0M
YoY Change	-27.57%	-24.75%	-50.92%
Gross Profit	$14.20M	-$2.400M	-$4.000M
YoY Change	-178.89%	-7.69%	-127.03%
Gross Profit Margin	6.72%	-1.17%	-2.6%
Selling, General & Admin	$18.60M	$17.90M	$16.80M
YoY Change	-30.86%	-16.36%	-16.83%
% of Gross Profit	130.99%
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$17.60M	$17.00M	$16.80M
YoY Change	-13.3%	4.29%	1.82%
% of Gross Profit	123.94%
Operating Expenses	$20.40M	$17.90M	$16.80M
YoY Change	-24.16%	-16.36%	-16.83%
Operating Profit	-$6.200M	-$20.30M	-$20.80M
YoY Change	-86.19%	-15.42%	285.19%
Interest Expense	-$3.500M	-$3.100M	$3.000M
YoY Change	-5.41%	-186.11%	-28.57%
% of Operating Profit
Other Income/Expense, Net	$500.0K	$10.60M	$8.100M
YoY Change	-101.59%	103.85%	3950.0%
Pretax Income	-$12.20M	-$13.60M	-$15.10M
YoY Change	-89.79%	-39.56%	2.03%
Income Tax	$600.0K	$300.0K	$200.0K
% Of Pretax Income
Net Earnings	-$12.80M	-$13.90M	-$15.30M
YoY Change	-84.87%	-18.24%	28.57%
Net Earnings / Revenue	-6.06%	-6.75%	-9.94%
Basic Earnings Per Share	-$0.28	-$0.31	-$0.34
Diluted Earnings Per Share	-$0.28	-$0.31	-$0.34
COMMON SHARES
Basic Shares Outstanding		45.00M	45.00M
Diluted Shares Outstanding		45.00M	45.00M

Balance Sheet

Concept	2020 Q4	2020 Q3	2020 Q2
SHORT-TERM ASSETS
Cash & Short-Term Investments	$102.8M	$74.80M	$75.50M
YoY Change	279.34%	306.52%	261.24%
Cash & Equivalents	$102.8M	$74.80M	$75.50M
Short-Term Investments
Other Short-Term Assets	$8.800M	$6.900M	$5.600M
YoY Change	12.82%	-12.66%	-26.32%
Inventory	$178.4M	$174.3M	$206.4M
Prepaid Expenses
Receivables	$63.30M	$81.20M	$63.60M
Other Receivables	$0.00	$0.00	$0.00
Total Short-Term Assets	$357.6M	$343.8M	$355.1M
YoY Change	-10.98%	-17.75%	-26.37%
LONG-TERM ASSETS
Property, Plant & Equipment	$569.8M	$582.4M	$595.4M
YoY Change	-9.04%	-9.42%	-8.36%
Goodwill
YoY Change
Intangibles	$9.300M	$10.10M	$11.20M
YoY Change	-34.97%	-37.65%	-35.63%
Long-Term Investments
YoY Change
Other Assets	$2.800M	$3.000M	$3.100M
YoY Change	-15.15%	11.11%	14.81%
Total Long-Term Assets	$636.4M	$639.9M	$648.6M
YoY Change	-6.89%	-7.17%	-6.98%
TOTAL ASSETS
Total Short-Term Assets	$357.6M	$343.8M	$355.1M
Total Long-Term Assets	$636.4M	$639.9M	$648.6M
Total Assets	$994.0M	$983.7M	$1.004B
YoY Change	-8.4%	-11.16%	-14.91%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$89.50M	$73.80M	$48.10M
YoY Change	29.15%	-6.58%	-56.39%
Accrued Expenses	$39.20M	$33.20M	$29.40M
YoY Change	69.7%	27.2%	21.49%
Deferred Revenue
YoY Change
Short-Term Debt	$38.90M	$82.20M	$81.00M
YoY Change
Long-Term Debt Due	$38.90M
YoY Change
Total Short-Term Liabilities	$181.0M	$202.9M	$169.9M
YoY Change	61.18%	65.63%	9.61%
LONG-TERM LIABILITIES
Long-Term Debt	$39.30M	$20.00M	$60.00M
YoY Change	-76.69%	-89.33%	-72.89%
Other Long-Term Liabilities	$11.00M	$11.80M	$11.40M
YoY Change	10.0%	13.46%	7.55%
Total Long-Term Liabilities	$50.30M	$11.80M	$11.40M
YoY Change	-71.84%	13.46%	7.55%
TOTAL LIABILITIES
Total Short-Term Liabilities	$181.0M	$202.9M	$169.9M
Total Long-Term Liabilities	$50.30M	$11.80M	$11.40M
Total Liabilities	$486.5M	$469.3M	$476.7M
YoY Change	-6.82%	-7.55%	-16.7%
SHAREHOLDERS EQUITY
Retained Earnings	-$363.4M	-$350.6M	-$336.7M
YoY Change	20.53%	27.96%	24.98%
Common Stock	$843.4M	$842.3M	$840.7M
YoY Change	-0.17%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$12.90M	$17.50M	$17.50M
YoY Change	-48.19%	-30.28%	-30.28%
Treasury Stock Shares	$600.0K	$700.0K	$700.0K
Shareholders Equity	$507.5M	$514.4M	$527.0M
YoY Change
Total Liabilities & Shareholders Equity	$994.0M	$983.7M	$1.004B
YoY Change	-8.4%	-11.16%	-14.91%

Cashflow Statement

Concept	2020 Q4	2020 Q3	2020 Q2
OPERATING ACTIVITIES
Net Income	-$12.80M	-$13.90M	-$15.30M
YoY Change	-84.87%	-18.24%	28.57%
Depreciation, Depletion And Amortization	$17.60M	$17.00M	$16.80M
YoY Change	-13.3%	4.29%	1.82%
Cash From Operating Activities	$52.50M	$41.10M	$16.10M
YoY Change	14.13%	-1.91%	0.63%
INVESTING ACTIVITIES
Capital Expenditures	-$3.900M	-$3.400M	-$6.700M
YoY Change	-76.07%	-63.83%	-15.19%
Acquisitions
YoY Change
Other Investing Activities	$900.0K	$1.600M	$600.0K
YoY Change
Cash From Investing Activities	-$3.000M	-$1.800M	-$6.100M
YoY Change	-81.6%	-80.85%	-22.78%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net
YoY Change
Debt Paid & Issued, Net
YoY Change
Cash From Financing Activities	-21.50M	-40.00M	-100.0K
YoY Change	2.38%	14.29%	-102.0%
NET CHANGE
Cash From Operating Activities	52.50M	41.10M	16.10M
Cash From Investing Activities	-3.000M	-1.800M	-6.100M
Cash From Financing Activities	-21.50M	-40.00M	-100.0K
Net Change In Cash	28.00M	-700.0K	9.900M
YoY Change	221.84%	-72.0%	-24.43%
FREE CASH FLOW
Cash From Operating Activities	$52.50M	$41.10M	$16.10M
Capital Expenditures	-$3.900M	-$3.400M	-$6.700M
Free Cash Flow	$56.40M	$44.50M	$22.80M
YoY Change	-9.47%	-13.26%	-4.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value
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CY2019	us-gaap	Restructuring Charges RestructuringCharges	8600000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-61900000
CY2020	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	815100000
CY2019	us-gaap	Gross Profit GrossProfit	22600000
CY2019	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	91800000
CY2018	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	98200000
CY2020	us-gaap	Restructuring Charges RestructuringCharges	3100000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-10000000.0
CY2020	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2020	dei	Security Exchange Name SecurityExchangeName	NYSE
CY2020	dei	Entity Registrant Name EntityRegistrantName	TIMKENSTEEL CORPORATION
CY2020	dei	Trading Symbol TradingSymbol	TMST
CY2020	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2020
CY2020	dei	Security12b Title Security12bTitle	Common shares
CY2020	dei	Entity Central Index Key EntityCentralIndexKey	0001598428
CY2020	dei	Entity Emerging Growth Company EntityEmergingGrowthCompany	false
CY2020	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-9300000
CY2018	us-gaap	Interest Expense InterestExpense	17100000
CY2020	us-gaap	Selling General And Administrative Expense SellingGeneralAndAdministrativeExpense	76700000
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-900000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-18600000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-110000000.0
CY2020	dei	Document Period End Date DocumentPeriodEndDate	2020-12-31
CY2020	dei	Amendment Flag AmendmentFlag	false
CY2020	dei	Document Type DocumentType	10-K
CY2020	dei	Entity Filer Category EntityFilerCategory	Accelerated Filer
CY2020	dei	Entity Small Business EntitySmallBusiness	false
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CY2020	us-gaap	Lessee Operating Lease Existence Of Option To Extend LesseeOperatingLeaseExistenceOfOptionToExtend	true
CY2020Q4	us-gaap	Lessee Operating Lease Renewal Term LesseeOperatingLeaseRenewalTerm	P1Y
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2019	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2018	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Fair Value Assumptions Expected Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardFairValueAssumptionsExpectedTerm1	P6Y
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P5Y2M12D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageRemainingContractualTerm1	P8Y8M12D
CY2020	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Weighted Average Remaining Contractual Term1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableWeightedAverageRemainingContractualTerm1	P4Y2M12D
CY2020	dei	Document Annual Report DocumentAnnualReport	true
CY2020	dei	Document Transition Report DocumentTransitionReport	false
CY2020	dei	Entity File Number EntityFileNumber	1-36313
CY2020	dei	Entity Incorporation State Country Code EntityIncorporationStateCountryCode	OH
CY2020	dei	Entity Tax Identification Number EntityTaxIdentificationNumber	46-4024951
CY2020	dei	Entity Address Address Line1 EntityAddressAddressLine1	1835 Dueber Avenue SW
CY2020	dei	Entity Address City Or Town EntityAddressCityOrTown	Canton
CY2020	dei	Entity Address State Or Province EntityAddressStateOrProvince	OH
CY2020	dei	Entity Address Postal Zip Code EntityAddressPostalZipCode	44706
CY2020	dei	City Area Code CityAreaCode	330
CY2020	dei	Local Phone Number LocalPhoneNumber	471.7000
CY2020	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	No
CY2020	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2020	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2020	dei	Entity Interactive Data Current EntityInteractiveDataCurrent	Yes
CY2020	dei	Icfr Auditor Attestation Flag IcfrAuditorAttestationFlag	true
CY2020	dei	Entity Shell Company EntityShellCompany	false
CY2020Q2	dei	Entity Public Float EntityPublicFloat	160935221
CY2021Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	45175486
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	830700000
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CY2019	us-gaap	Cost Of Goods And Services Sold CostOfGoodsAndServicesSold	1186200000
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CY2020	us-gaap	Interest Expense InterestExpense	12200000
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CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	14200000
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CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	-60700000
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CY2020	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	100000
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CY2019Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	45700000
CY2020Q4	us-gaap	Common Stock Value CommonStockValue	0
CY2019Q4	us-gaap	Common Stock Value CommonStockValue	0
CY2020Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	843400000
CY2019Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	844800000
CY2020Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-363400000
CY2019Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	-301500000
CY2020Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	600000
CY2019Q4	us-gaap	Treasury Stock Shares TreasuryStockShares	900000
CY2020Q4	us-gaap	Treasury Stock Value TreasuryStockValue	12900000
CY2019Q4	us-gaap	Treasury Stock Value TreasuryStockValue	24900000
CY2020Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	40400000
CY2019Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	44700000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	507500000
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	563100000
CY2020Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	994000000.0
CY2019Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	1085200000
CY2017Q4	us-gaap	Stockholders Equity StockholdersEquity	616700000
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-10000000.0
CY2018	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1300000
CY2018	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7300000
CY2018	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	200000
CY2018	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	700000
CY2018Q4	us-gaap	Stockholders Equity StockholdersEquity	612900000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-110000000.0
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	53600000
CY2019	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	7400000
CY2019	us-gaap	Stock Issued During Period Value Stock Options Exercised StockIssuedDuringPeriodValueStockOptionsExercised	200000
CY2019	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	1000000.0
CY2019Q4	us-gaap	Stockholders Equity StockholdersEquity	563100000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-61900000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4300000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Sharebased Compensation Requisite Service Period Recognition Value AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue	6600000
CY2020	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	600000
CY2020	us-gaap	Adjustments To Additional Paid In Capital Equity Component Of Convertible Debt AdjustmentsToAdditionalPaidInCapitalEquityComponentOfConvertibleDebt	4600000
CY2020Q4	us-gaap	Stockholders Equity StockholdersEquity	507500000
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-61900000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-110000000.0
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-10000000.0
CY2020	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	70000000.0
CY2019	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73500000
CY2018	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	73000000.0
CY2020	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5300000
CY2019	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5100000
CY2018	us-gaap	Amortization Of Financing Costs And Discounts AmortizationOfFinancingCostsAndDiscounts	5500000
CY2020	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-900000
CY2020	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	2400000
CY2019	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-9300000
CY2018	us-gaap	Gain Loss On Sales Of Assets And Asset Impairment Charges GainLossOnSalesOfAssetsAndAssetImpairmentCharges	-900000
CY2019	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	16600000
CY2018	us-gaap	Increase Decrease In Deferred Income Taxes IncreaseDecreaseInDeferredIncomeTaxes	-800000
CY2020	us-gaap	Share Based Compensation ShareBasedCompensation	6600000
CY2019	us-gaap	Share Based Compensation ShareBasedCompensation	7400000
CY2018	tmst	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash Excluding Mark To Market Adjustments PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncashExcludingMarkToMarketAdjustments	37400000
CY2018	us-gaap	Share Based Compensation ShareBasedCompensation	7300000
CY2020	tmst	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash Excluding Mark To Market Adjustments PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncashExcludingMarkToMarketAdjustments	8600000
CY2019	tmst	Pension And Other Postretirement Benefits Expense Reversal Of Expense Noncash Excluding Mark To Market Adjustments PensionAndOtherPostretirementBenefitsExpenseReversalOfExpenseNoncashExcludingMarkToMarketAdjustments	41600000
CY2020	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-14200000
CY2019	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-85900000
CY2018	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	13600000
CY2020	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-103500000
CY2019	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-92600000
CY2018	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	94500000
CY2020	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	23100000
CY2019	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-87700000
CY2018	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	24400000
CY2020	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	9400000
CY2019	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-26000000.0
CY2018	us-gaap	Increase Decrease In Accrued Liabilities IncreaseDecreaseInAccruedLiabilities	-3800000
CY2020	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	700000
CY2019	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-200000
CY2018	us-gaap	Increase Decrease In Prepaid Expense IncreaseDecreaseInPrepaidExpense	-400000
CY2020	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	4100000
CY2019	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	3800000
CY2018	us-gaap	Pension And Other Postretirement Benefit Contributions PensionAndOtherPostretirementBenefitContributions	13100000
CY2020	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-1000000.0
CY2019	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	1200000
CY2018	us-gaap	Increase Decrease In Other Operating Capital Net IncreaseDecreaseInOtherOperatingCapitalNet	-3800000
CY2020	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	173500000
CY2019	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	70300000
CY2018	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	18500000
CY2020	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	16900000
CY2019	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	38000000.0
CY2018	us-gaap	Payments For Capital Improvements PaymentsForCapitalImprovements	40000000.0
CY2020	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	10900000
CY2018	us-gaap	Proceeds From Sale Of Property Plant And Equipment ProceedsFromSaleOfPropertyPlantAndEquipment	1000000.0
CY2020	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-6000000.0
CY2019	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-38000000.0
CY2018	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-39000000.0
CY2019	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	200000
CY2018	us-gaap	Proceeds From Stock Options Exercised ProceedsFromStockOptionsExercised	200000
CY2020	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	600000
CY2019	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	1000000.0
CY2018	us-gaap	Payments Related To Tax Withholding For Share Based Compensation PaymentsRelatedToTaxWithholdingForShareBasedCompensation	700000
CY2018	us-gaap	Repayments Of Pollution Control Bond RepaymentsOfPollutionControlBond	30200000
CY2020	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	90000000.0
CY2019	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	65000000.0
CY2018	us-gaap	Repayments Of Long Term Lines Of Credit RepaymentsOfLongTermLinesOfCredit	105000000.0
CY2019	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	40000000.0
CY2018	us-gaap	Proceeds From Long Term Lines Of Credit ProceedsFromLongTermLinesOfCredit	155000000.0
CY2020	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1200000
CY2019	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1000000.0
CY2018	us-gaap	Payments Of Debt Issuance Costs PaymentsOfDebtIssuanceCosts	1700000
CY2020	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-91800000
CY2019	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	-26800000
CY2018	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	17600000
CY2020	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents Period Increase Decrease Including Exchange Rate Effect CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect	75700000
CY2019Q4	us-gaap	Cash Cash Equivalents Restricted Cash And Restricted Cash Equivalents CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalents	27100000
CY2020	tmst	Annual Melt Capacity AnnualMeltCapacity	2000000
CY2020	tmst	Annual Shipment Capacity AnnualShipmentCapacity	1500000
CY2020	us-gaap	Guarantees Indemnifications And Warranties Policies GuaranteesIndemnificationsAndWarrantiesPolicies	<p style="text-align:justify;margin-bottom:0pt;margin-top:9pt;text-indent:0%;font-weight:bold;font-style:italic;font-size:10pt;font-family:Times New Roman;text-transform:none;font-variant: normal;">Product Warranties:</p> <p style="text-align:justify;margin-bottom:0pt;margin-top:9pt;text-indent:0%;font-size:10pt;font-family:Times New Roman;font-weight:normal;font-style:normal;text-transform:none;font-variant: normal;">TimkenSteel accrues liabilities for warranties based upon specific claim incidents in accordance with accounting rules relating to contingent liabilities. Should TimkenSteel become aware of a specific potential warranty claim for which liability is probable and reasonably estimable, a specific charge is recorded and accounted for accordingly. TimkenSteel had no significant warranty claims for the years ended December 31, 2020, 2019 or 2018.</p>
CY2020	tmst	Warranty Claims WarrantyClaims	0
CY2019	tmst	Warranty Claims WarrantyClaims	0
CY2018	tmst	Warranty Claims WarrantyClaims	0
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000
CY2019	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	0
CY2019Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	900000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	1000000.0
CY2019Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	5400000
CY2020Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	2800000
CY2019Q4	us-gaap	Deferred Tax Assets State Taxes DeferredTaxAssetsStateTaxes	4500000
CY2020Q4	tmst	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	5000000.0
CY2019Q4	tmst	Deferred Tax Assets Leasing Arrangements DeferredTaxAssetsLeasingArrangements	3400000
CY2019Q4	tmst	Deferred Tax Assets Disallowed Business Interest DeferredTaxAssetsDisallowedBusinessInterest	6000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	600000
CY2020	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	1800000
CY2019	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	4100000
CY2018	us-gaap	Research And Development Expense ResearchAndDevelopmentExpense	8100000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	830700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1208800000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1610600000
CY2020Q4	us-gaap	Noncurrent Assets NoncurrentAssets	600100000
CY2019Q4	us-gaap	Noncurrent Assets NoncurrentAssets	655000000.0
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	830700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1208800000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1610600000
CY2020	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	830700000
CY2019	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1208800000
CY2018	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	1610600000
	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated RestructuringAndRelatedCostNumberOfPositionsEliminated	215
CY2020	us-gaap	Restructuring Charges RestructuringCharges	3100000
CY2020	us-gaap	Restructuring Charges RestructuringCharges	3100000
CY2019	us-gaap	Restructuring Charges RestructuringCharges	8600000
CY2020	us-gaap	Restructuring And Related Cost Number Of Positions Eliminated RestructuringAndRelatedCostNumberOfPositionsEliminated	55
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	6000000.0
CY2020	us-gaap	Restructuring Charges RestructuringCharges	3100000
CY2020	us-gaap	Payments For Restructuring PaymentsForRestructuring	7600000
CY2020Q4	us-gaap	Restructuring Reserve RestructuringReserve	1500000
CY2020	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	500000
CY2019	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	-2000000.0
CY2019	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	-200000
CY2018	us-gaap	Deferred Foreign Income Tax Expense Benefit DeferredForeignIncomeTaxExpenseBenefit	400000
CY2020	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	100000
CY2019	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	-16600000
CY2018	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	800000
CY2019	us-gaap	Restructuring Charges RestructuringCharges	8600000
CY2019	us-gaap	Payments For Restructuring PaymentsForRestructuring	2600000
CY2020	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-400000
CY2020	us-gaap	Restructuring Reserve Accelerated Depreciation RestructuringReserveAcceleratedDepreciation	100000
CY2019Q4	us-gaap	Restructuring Reserve RestructuringReserve	6000000.0
CY2019	us-gaap	Restructuring Charges RestructuringCharges	8600000
CY2019	us-gaap	Restructuring Reserve Accelerated Depreciation RestructuringReserveAcceleratedDepreciation	300000
CY2018	us-gaap	Restructuring Charges RestructuringCharges	0
CY2020	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Excluding Service Component PensionCostandOtherPostretirementBenefitsCostReversalofCostExcludingServiceComponent	-26600000
CY2019	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Excluding Service Component PensionCostandOtherPostretirementBenefitsCostReversalofCostExcludingServiceComponent	-17500000
CY2018	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Excluding Service Component PensionCostandOtherPostretirementBenefitsCostReversalofCostExcludingServiceComponent	-25200000
CY2020	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Remeasurement PensionCostandOtherPostretirementBenefitsCostReversalofCostRemeasurement	14700000
CY2019	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Remeasurement PensionCostandOtherPostretirementBenefitsCostReversalofCostRemeasurement	40600000
CY2018	tmst	Pension Costand Other Postretirement Benefits Cost Reversalof Cost Remeasurement PensionCostandOtherPostretirementBenefitsCostReversalofCostRemeasurement	43500000
CY2020	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000
CY2018	us-gaap	Foreign Currency Transaction Gain Loss Before Tax ForeignCurrencyTransactionGainLossBeforeTax	-200000
CY2020	tmst	Employee Retention Credit EmployeeRetentionCredit	-2300000
CY2020	tmst	Miscellaneous Nonoperating Income Expense MiscellaneousNonoperatingIncomeExpense	200000
CY2019	tmst	Miscellaneous Nonoperating Income Expense MiscellaneousNonoperatingIncomeExpense	-200000
CY2018	tmst	Miscellaneous Nonoperating Income Expense MiscellaneousNonoperatingIncomeExpense	-100000
CY2020	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	14200000
CY2019	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-23300000
CY2018	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-18600000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-64100000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-130800000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	-10100000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	3400000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	4700000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Foreign IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign	1900000
CY2020	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-60700000
CY2019	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-126100000
CY2018	us-gaap	Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments	-8200000
CY2020	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	600000
CY2019	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	100000
CY2018	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	300000
CY2020	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	500000
CY2019	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	400000
CY2018	us-gaap	Current Foreign Tax Expense Benefit CurrentForeignTaxExpenseBenefit	700000
CY2020	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1100000
CY2019	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	500000
CY2018	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	1000000.0
CY2019	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	-14400000
CY2018	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	400000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1200000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-16100000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1800000
CY2018	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-6300000
CY2020	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-12700000
CY2019	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	-26500000
CY2020	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	2300000
CY2019	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-1300000
CY2018	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	-500000
CY2020	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	100000
CY2018	us-gaap	Income Tax Reconciliation Foreign Income Tax Rate Differential IncomeTaxReconciliationForeignIncomeTaxRateDifferential	200000
CY2019	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	-200000
CY2018	us-gaap	Income Tax Reconciliation Tax Credits Research IncomeTaxReconciliationTaxCreditsResearch	200000
CY2020	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10300000
CY2019	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	10200000
CY2018	us-gaap	Income Tax Reconciliation Change In Deferred Tax Assets Valuation Allowance IncomeTaxReconciliationChangeInDeferredTaxAssetsValuationAllowance	7500000
CY2019	tmst	Effective Income Tax Rate Reconciliation Global Intangible Low Tax Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomeAmount	200000
CY2018	tmst	Effective Income Tax Rate Reconciliation Global Intangible Low Tax Income Amount EffectiveIncomeTaxRateReconciliationGlobalIntangibleLowTaxIncomeAmount	500000
CY2020	tmst	Effective Income Tax Rate Reconciliation Permanent Differences Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesAmount	1300000
CY2019	tmst	Effective Income Tax Rate Reconciliation Permanent Differences Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesAmount	1300000
CY2018	tmst	Effective Income Tax Rate Reconciliation Permanent Differences Amount EffectiveIncomeTaxRateReconciliationPermanentDifferencesAmount	800000
CY2020	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-100000
CY2019	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-200000
CY2018	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-200000
CY2020	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1200000
CY2019	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	-16100000
CY2018	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	1800000
CY2020	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.020
CY2019	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.128
CY2018	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	-0.059
CY2020Q3	tmst	Dividends Declared DividendsDeclared	5100000
CY2020Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	2700000
CY2019Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	6500000
CY2018Q4	us-gaap	Undistributed Earnings Of Foreign Subsidiaries UndistributedEarningsOfForeignSubsidiaries	5500000
CY2020Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	300000
CY2019Q4	us-gaap	Deferred Tax Liabilities Undistributed Foreign Earnings DeferredTaxLiabilitiesUndistributedForeignEarnings	700000
CY2020Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	97500000
CY2019Q4	us-gaap	Deferred Tax Liabilities Property Plant And Equipment DeferredTaxLiabilitiesPropertyPlantAndEquipment	98600000
CY2020Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	16200000
CY2019Q4	us-gaap	Deferred Tax Liabilities Deferred Expense Capitalized Inventory Costs DeferredTaxLiabilitiesDeferredExpenseCapitalizedInventoryCosts	24300000
CY2020Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	1600000
CY2019Q4	us-gaap	Deferred Tax Liabilities Financing Arrangements DeferredTaxLiabilitiesFinancingArrangements	1700000
CY2020Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	5000000.0
CY2019Q4	us-gaap	Deferred Tax Liabilities Leasing Arrangements DeferredTaxLiabilitiesLeasingArrangements	3400000
CY2020Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	300000
CY2019Q4	us-gaap	Deferred Tax Liabilities Other DeferredTaxLiabilitiesOther	700000
CY2020Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	120600000
CY2019Q4	us-gaap	Deferred Income Tax Liabilities DeferredIncomeTaxLiabilities	128700000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	50300000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Pensions DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPensions	47900000
CY2020Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	8700000
CY2019Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits	7200000
CY2020Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	94400000
CY2019Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards Domestic DeferredTaxAssetsOperatingLossCarryforwardsDomestic	86000000.0
CY2020Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	1000000.0
CY2019Q4	us-gaap	Deferred Tax Assets Goodwill And Intangible Assets DeferredTaxAssetsGoodwillAndIntangibleAssets	1100000
CY2020Q4	us-gaap	Deferred Tax Assets Inventory DeferredTaxAssetsInventory	4500000
CY2019Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	1200000
CY2020Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	167300000
CY2019Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	162700000
CY2020Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	47700000
CY2019Q4	us-gaap	Deferred Tax Assets Valuation Allowance DeferredTaxAssetsValuationAllowance	34900000
CY2020Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	119600000
CY2019Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	127800000
CY2020Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	1000000.0
CY2019Q4	us-gaap	Deferred Income Tax Liabilities Net DeferredIncomeTaxLiabilitiesNet	900000
CY2020Q4	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	406800000
CY2020Q4	us-gaap	Operating Loss Carryforwards Valuation Allowance OperatingLossCarryforwardsValuationAllowance	47700000
CY2020Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2019Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2018Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	0
CY2020Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0
CY2019Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0
CY2018Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	0
CY2020Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2019Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2018Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued	0
CY2020	us-gaap	Net Income Loss NetIncomeLoss	-61900000
CY2019	us-gaap	Net Income Loss NetIncomeLoss	-110000000.0
CY2018	us-gaap	Net Income Loss NetIncomeLoss	-10000000.0
CY2020	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	45000000.0
CY2019	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44800000
CY2018	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	44600000
CY2020	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	45000000.0
CY2019	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44800000
CY2018	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	44600000
CY2020	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.38
CY2019	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-2.46
CY2018	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.22
CY2020	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.38
CY2019	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-2.46
CY2018	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.22
CY2020Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	37600000
CY2019Q4	us-gaap	Other Inventory Supplies OtherInventorySupplies	49800000
CY2020Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	20000000.0
CY2019Q4	us-gaap	Inventory Raw Materials InventoryRawMaterials	26000000.0
CY2020Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	79100000
CY2019Q4	us-gaap	Inventory Work In Process InventoryWorkInProcess	123700000
CY2020Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	55600000
CY2019Q4	us-gaap	Inventory Finished Goods InventoryFinishedGoods	93100000
CY2020Q4	us-gaap	Inventory Gross InventoryGross	192300000
CY2019Q4	us-gaap	Inventory Gross InventoryGross	292600000
CY2020Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	13900000
CY2019Q4	us-gaap	Inventory Valuation Reserves InventoryValuationReserves	10700000
CY2020Q4	us-gaap	Inventory Net InventoryNet	178400000
CY2019Q4	us-gaap	Inventory Net InventoryNet	281900000
CY2020Q4	us-gaap	Operating Lease Liability OperatingLeaseLiability	21000000.0
CY2020Q4	tmst	Lessee Operating Lease Lease Notyet Commenced Amount LesseeOperatingLeaseLeaseNotyetCommencedAmount	0
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4136
CY2020Q4	us-gaap	Land Land	13300000
CY2019Q4	us-gaap	Land Land	13300000
CY2020Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	422500000
CY2019Q4	us-gaap	Buildings And Improvements Gross BuildingsAndImprovementsGross	419000000.0
CY2020Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	1398700000
CY2019Q4	us-gaap	Machinery And Equipment Gross MachineryAndEquipmentGross	1404600000
CY2020Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	11000000.0
CY2019Q4	us-gaap	Construction In Progress Gross ConstructionInProgressGross	30900000
CY2020Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1845500000
CY2019Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	1867800000
CY2020Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1275700000
CY2019Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	1241400000
CY2020Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	569800000
CY2019Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	626400000
CY2020	us-gaap	Depreciation Depreciation	65000000.0
CY2019	us-gaap	Depreciation Depreciation	67400000
CY2018	us-gaap	Depreciation Depreciation	67500000
CY2020	tmst	Disposal Group Accelerated Depreciation Expense DisposalGroupAcceleratedDepreciationExpense	2400000
CY2019	tmst	Disposal Group Accelerated Depreciation Expense DisposalGroupAcceleratedDepreciationExpense	1900000
CY2020	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	2600000
CY2019	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	9000000.0
CY2018	us-gaap	Gain Loss On Disposition Of Assets GainLossOnDispositionOfAssets	500000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	73300000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	64000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	9300000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Gross FiniteLivedIntangibleAssetsGross	76400000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Accumulated Amortization FiniteLivedIntangibleAssetsAccumulatedAmortization	62100000
CY2019Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	14300000
CY2020	tmst	Finite Lived Intangible Asset Weighted Average Remaining Useful Life FiniteLivedIntangibleAssetWeightedAverageRemainingUsefulLife	P8Y
CY2020	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5000000.0
CY2019	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	6100000
CY2018	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	5500000
CY2020	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	200000
CY2019	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	100000
CY2018	us-gaap	Gain Loss On Disposition Of Intangible Assets GainLossOnDispositionOfIntangibleAssets	400000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	3100000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	2600000
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	2000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	1000000.0
CY2020Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	100000
CY2020Q4	us-gaap	Finance Lease Liability FinanceLeaseLiability	0
CY2020Q4	us-gaap	Operating Lease Weighted Average Remaining Lease Term1 OperatingLeaseWeightedAverageRemainingLeaseTerm1	P3Y4M24D
CY2020	us-gaap	Operating Lease Cost OperatingLeaseCost	8800000
CY2019	us-gaap	Operating Lease Cost OperatingLeaseCost	7400000
CY2020	us-gaap	Short Term Lease Cost ShortTermLeaseCost	700000
CY2019	us-gaap	Short Term Lease Cost ShortTermLeaseCost	1900000
CY2020	us-gaap	Lease Cost LeaseCost	9500000
CY2019	us-gaap	Lease Cost LeaseCost	9300000
CY2020Q4	us-gaap	Operating Lease Weighted Average Discount Rate Percent OperatingLeaseWeightedAverageDiscountRatePercent	0.032
CY2020	us-gaap	Operating Lease Payments OperatingLeasePayments	8800000
CY2019	us-gaap	Operating Lease Payments OperatingLeasePayments	7500000
CY2020	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	12500000
CY2019	us-gaap	Right Of Use Asset Obtained In Exchange For Operating Lease Liability RightOfUseAssetObtainedInExchangeForOperatingLeaseLiability	4300000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Next Twelve Months LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths	8400000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Two LesseeOperatingLeaseLiabilityPaymentsDueYearTwo	5700000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Three LesseeOperatingLeaseLiabilityPaymentsDueYearThree	4800000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due Year Four LesseeOperatingLeaseLiabilityPaymentsDueYearFour	2700000
CY2020Q4	tmst	Lessee Operating Lease Liability Payments Due After Year Four LesseeOperatingLeaseLiabilityPaymentsDueAfterYearFour	900000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Payments Due LesseeOperatingLeaseLiabilityPaymentsDue	22500000
CY2020Q4	us-gaap	Lessee Operating Lease Liability Undiscounted Excess Amount LesseeOperatingLeaseLiabilityUndiscountedExcessAmount	1500000
CY2020Q4	us-gaap	Long Term Debt LongTermDebt	78200000
CY2019Q4	us-gaap	Long Term Debt LongTermDebt	168600000
CY2020Q4	us-gaap	Long Term Debt Current LongTermDebtCurrent	38900000
CY2020Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	39300000
CY2019Q4	us-gaap	Long Term Debt Noncurrent LongTermDebtNoncurrent	168600000
CY2020	us-gaap	Interest Paid InterestPaid	7600000
CY2019	us-gaap	Interest Paid InterestPaid	11500000
CY2020	tmst	Increase Decrease To Additional Paid In Capital IncreaseDecreaseToAdditionalPaidInCapital	-10600000
CY2020	tmst	Increase Decrease In Current Convertible Notes Net IncreaseDecreaseInCurrentConvertibleNotesNet	1100000
CY2020	tmst	Increase Decrease In Non Current Convertible Notes Net IncreaseDecreaseInNonCurrentConvertibleNotesNet	5300000
CY2019	tmst	Benefit Cost Amortization Period BenefitCostAmortizationPeriod	P12Y
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4167
CY2020	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	3200000
CY2019	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	7100000
CY2018	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	6300000
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	2.23
CY2019Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	5.54
CY2018Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Nonvested Weighted Average Grant Date Fair Value SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue	7.46
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0096
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0263
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Risk Free Interest Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate	0.0277
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2019	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2018	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Dividend Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedDividendRate	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Fair Value Assumptions Expected Volatility Rate ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate	0.4267
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2641570
CY2019Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	20.64
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Gross ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross	511020
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	5.26
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0
CY2020	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	0
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriod	221525
CY2020	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures And Expirations In Period Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresAndExpirationsInPeriodWeightedAverageExercisePrice	12.08
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2931065
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	18.61
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingIntrinsicValue	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber	641392
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingWeightedAverageExercisePrice	8.21
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Vested And Expected To Vest Outstanding Aggregate Intrinsic Value ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue	0
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	2289673
CY2020Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	21.52
CY2020Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	0
CY2020	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0
CY2020	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	6600000
CY2019	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7400000
CY2018	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	7300000
CY2020Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	6100000
CY2020	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1 EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1	P1Y6M
CY2020	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	1400000
CY2020	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	5600000
CY2020	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	100000
CY2020	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-4300000
CY2019	us-gaap	Oci Before Reclassifications Before Tax Attributable To Parent OciBeforeReclassificationsBeforeTaxAttributableToParent	500000
CY2019	us-gaap	Reclassification From Aoci Current Period Before Tax Attributable To Parent ReclassificationFromAociCurrentPeriodBeforeTaxAttributableToParent	2400000
CY2019	tmst	Other Comprehensive Income Loss Deferrals Before Tax OtherComprehensiveIncomeLossDeferralsBeforeTax	72200000
CY2019	us-gaap	Other Comprehensive Income Loss Tax Portion Attributable To Parent1 OtherComprehensiveIncomeLossTaxPortionAttributableToParent1	16700000
CY2019	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	53600000
CY2020Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	1000000.0
CY2019Q4	us-gaap	Loss Contingency Accrual At Carrying Value LossContingencyAccrualAtCarryingValue	1500000
CY2020	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	23400000
CY2020	tmst	Revenuefrom Related Partiesasa Percentageof Consolidated Net Sales RevenuefromRelatedPartiesasaPercentageofConsolidatedNetSales	0.028
CY2019	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	26100000
CY2019	tmst	Revenuefrom Related Partiesasa Percentageof Consolidated Net Sales RevenuefromRelatedPartiesasaPercentageofConsolidatedNetSales	0.022
CY2018	us-gaap	Revenue From Related Parties RevenueFromRelatedParties	43200000
CY2018	tmst	Revenuefrom Related Partiesasa Percentageof Consolidated Net Sales RevenuefromRelatedPartiesasaPercentageofConsolidatedNetSales	0.027
CY2020Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	211200000
CY2020Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	205900000
CY2020Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	154000000.0
CY2020Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	259700000
CY2020Q4	us-gaap	Gross Profit GrossProfit	14200000
CY2020Q3	us-gaap	Gross Profit GrossProfit	-2400000
CY2020Q2	us-gaap	Gross Profit GrossProfit	-4000000.0
CY2020Q1	us-gaap	Gross Profit GrossProfit	7800000
CY2020Q4	us-gaap	Net Income Loss NetIncomeLoss	-12800000
CY2020Q3	us-gaap	Net Income Loss NetIncomeLoss	-13900000
CY2020Q2	us-gaap	Net Income Loss NetIncomeLoss	-15300000
CY2020Q1	us-gaap	Net Income Loss NetIncomeLoss	-19900000
CY2020Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.28
CY2020Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.31
CY2020Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.34
CY2020Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.44
CY2020Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.28
CY2020Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.31
CY2020Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.34
CY2020Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.44
CY2019Q4	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	226900000
CY2019Q3	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	274200000
CY2019Q2	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	336700000
CY2019Q1	us-gaap	Revenue From Contract With Customer Excluding Assessed Tax RevenueFromContractWithCustomerExcludingAssessedTax	371000000.0
CY2019Q4	us-gaap	Gross Profit GrossProfit	-18000000.0
CY2019Q3	us-gaap	Gross Profit GrossProfit	-2600000
CY2019Q2	us-gaap	Gross Profit GrossProfit	14800000
CY2019Q1	us-gaap	Gross Profit GrossProfit	28400000
CY2019Q4	us-gaap	Net Income Loss NetIncomeLoss	-84600000
CY2019Q3	us-gaap	Net Income Loss NetIncomeLoss	-17000000.0
CY2019Q2	us-gaap	Net Income Loss NetIncomeLoss	-11900000
CY2019Q1	us-gaap	Net Income Loss NetIncomeLoss	3500000
CY2019Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-1.89
CY2019Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.38
CY2019Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	-0.27
CY2019Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.08
CY2019Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-1.89
CY2019Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.38
CY2019Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	-0.27
CY2019Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.08

Files In Submission

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$MTUS
Metallus Inc. Stock $mtus

2020 Q4 Form 10-K Financial Statement

#000156459021008896 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTUS Metallus Inc. Stock $mtus

2020 Q4 Form 10-K Financial Statement

#000156459021008896 Filed on February 25, 2021

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$MTUS
Metallus Inc. Stock $mtus