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Retirement and Postretirement Benefits - Amounts Recognized in Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Pension    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Unrecognized prior service cost $ 0.5 $ 1.6
Postretirement    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Unrecognized prior service cost $ (67.8) $ 0.9