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Retirement and Deferred Compensation Plans - Reconciliation of Changes (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
An Additional German Plan      
Funded Status at End of Year      
Funded status, end of year $ (61.8) $ (56.8)  
United States Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year 53.1 53.1  
Service cost 0.0 0.0  
Interest cost 1.7 1.8  
Curtailment and settlement 0.0 0.0  
Transfers 0.0 0.0  
Actuarial (gain) loss 3.0 2.2  
Plan participant contributions 0.0 0.0  
Benefits paid (4.1) (4.0)  
Currency exchange rate changes 0.0 0.0  
Benefit obligation, end of year 53.7 53.1 $ 53.1
Change in Plan Assets      
Fair value of plan assets, beginning of year 37.3 37.2  
Actual return on plan assets 3.0 1.7  
Settlement 0.0 0.0  
Transfers 0.0 0.0  
Plan participant contributions 0.0 0.0  
Company contributions 2.5 2.4  
Benefits paid (4.1) (4.0)  
Currency exchange rate changes 0.0 0.0  
Fair value of plan assets, end of year 38.7 37.3 37.2
Funded Status at End of Year      
Funded status, end of year (15.0) (15.8)  
Amounts Recognized      
Noncurrent assets 15.3 14.3  
Current liabilities (2.5) (2.5)  
Noncurrent liabilities (27.8) (27.6)  
Net amount recognized (15.0) (15.8)  
Non-United States Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year 416.0 326.1  
Service cost 10.1 8.0  
Interest cost 8.9 10.0  
Curtailment and settlement 0.0 (29.0)  
Transfers 9.3 105.4  
Actuarial (gain) loss 1.0 39.8  
Plan participant contributions 0.2 0.2  
Benefits paid (9.5) (7.7)  
Currency exchange rate changes 53.5 (36.8)  
Benefit obligation, end of year 489.5 416.0 326.1
Change in Plan Assets      
Fair value of plan assets, beginning of year 324.5 314.7  
Actual return on plan assets 13.4 44.6  
Settlement 0.0 (26.1)  
Transfers 1.8 34.9  
Plan participant contributions 0.2 0.2  
Company contributions 7.9 0.5  
Benefits paid (9.5) (7.7)  
Currency exchange rate changes 38.4 (36.6)  
Fair value of plan assets, end of year 376.7 324.5 314.7
Funded Status at End of Year      
Funded status, end of year (112.8) (91.5)  
Amounts Recognized      
Noncurrent assets 36.8 30.4  
Current liabilities (0.4) (0.8)  
Noncurrent liabilities (149.2) (121.1)  
Net amount recognized (112.8) (91.5)  
Retiree Health Care Plan      
Change in Benefit Obligation      
Benefit obligation, beginning of year 15.6 16.4  
Interest cost 0.6 0.7 0.7
Actuarial (gain) loss (0.3) 0.2  
Benefits paid (1.0) (1.7)  
Benefit obligation, end of year 14.9 15.6 $ 16.4
Change in Plan Assets      
Benefits paid (1.0) (1.7)  
Funded Status at End of Year      
Funded status, end of year (14.9) (15.6)  
Amounts Recognized      
Current liabilities (1.2) (1.3)  
Noncurrent liabilities (13.7) (14.3)  
Net amount recognized $ (14.9) $ (15.6)