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Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2018
Dec. 31, 2019
Schedule of accumulated other comprehensive loss      
Reclassification of stranded tax effect resulting from Tax Reform to retained earnings   $ (5.5)  
Balance at the beginning of the period $ (105.1)    
Other current-year change 27.2    
Balance at the end of the period (77.9)    
Deferred tax assets in accumulated other comprehensive loss, pension liabilities 5.8   $ 7.9
Income tax portion attributable to settlement of frozen defined benefit plan 3.4    
Foreign Currency Translation Loss      
Schedule of accumulated other comprehensive loss      
Balance at the beginning of the period (64.4)    
Other current-year change 11.7    
Balance at the end of the period (52.7)    
Pension and Postretirement Benefit Adjustments, Net of Tax      
Schedule of accumulated other comprehensive loss      
Balance at the beginning of the period (40.7)    
Other current-year change 15.5    
Balance at the end of the period $ (25.2)