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Label Element Value
Retained Earnings [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption $ 1,300,000 [1]
Accumulated Gain (Loss), Net, Cash Flow Hedge, Parent [Member]  
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity 2,000,000.0
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity 2,100,000
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity 2,100,000
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]  
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity (93,400,000)
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity (93,800,000)
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity (101,700,000)
AOCI Attributable to Parent [Member]  
Cumulative Effect of New Accounting Principle in Period of Adoption us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption (1,300,000) [1]
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity (91,700,000)
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity (91,300,000)
Stockholders' Equity Attributable to Parent us-gaap_StockholdersEquity $ (99,700,000)
[1] ASU 2018-02 Income Statement-Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. See Note 8. Income Taxes for further information regarding our adoption of ASU 2018-02.