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Retirement and Postretirement Benefits - Amounts Expected to be Amortized from Accumulated Other Comprehensive Loss in Next Fiscal Year (Details)
$ in Millions
Dec. 31, 2018
USD ($)
Pension  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Prior service cost $ 0.4
Postretirement  
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Prior service cost $ 0.1