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Equity - Accumulated Other Comprehensive Loss (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Schedule of accumulated other comprehensive loss    
Balance at the beginning of the year $ (104.7)  
Current-year change 33.1  
Balance as of December 31, 2017 (71.6)  
Deferred tax assets in accumulated other comprehensive loss, pension liabilities 13.6 $ 14.9
Foreign Currency Translation (Loss) Gain    
Schedule of accumulated other comprehensive loss    
Balance at the beginning of the year (79.9)  
Current-year change 28.8  
Balance as of December 31, 2017 (51.1)  
Pension and Postretirement Benefit Adjustments, Net of Tax    
Schedule of accumulated other comprehensive loss    
Balance at the beginning of the year (24.8)  
Current-year change 4.3  
Balance as of December 31, 2017 $ (20.5)