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Pensions and Other Postretirement Benefits Contributions to Plans (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans $ 37.5 $ 56.5
Pension Plan    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans 36.0 54.5
Pension Plan | Non-U.S.    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans 0.0 1.1
Other postretirement benefits, net of participant contributions    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans 1.5 2.0
Qualified Plan | Pension Plan | UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans 30.0 44.0
Nonqualified Plan | Pension Plan | UNITED STATES    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Contributions to pension and other postretirement plans $ 6.0 $ 9.4