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Pension and Other Postretirement Benefit Plans - Health Care Cost Trend Rates (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]  
100 bp increase in healthcare cost trend rates, postretirement benefit obligation $ 9.7
100 bp increase in healthcare cost trend rates, net periodic postretirement cost 0.5
100 bp decrease in healthcare cost trend rates, postretirement benefit obligation (8.2)
100 bp decrease in healthcare cost trend rates, net periodic postretirement cost $ (0.4)
U.S.  
Defined Benefit Plan Disclosure [Line Items]  
Initial healthcare cost trend rate 6.80%
Ultimate healthcare cost trend rate 4.50%
Foreign  
Defined Benefit Plan Disclosure [Line Items]  
Initial healthcare cost trend rate 4.70%
Ultimate healthcare cost trend rate 4.00%