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Employee Benefit Plans - Reconciliation of the Changes in Benefit Obligation, Plan Assets, and Funded Status (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Change in Plan Assets      
Fair value of plan assets, beginning of year $ 161.3    
Fair value of plan assets, end of year 125.1 $ 161.3  
U.S. Pension Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year 162.3 155.6  
Service cost 0.0 0.0  
Interest cost 5.2 5.3  
Participant contributions 0.0 0.0  
Plan amendments 0.0 0.0  
Actuarial (gain) loss (9.2) 10.0  
Currency translation adjustment 0.0 0.0  
Pension settlement (18.9) 0.0  
Benefits paid (8.8) (8.6)  
Benefit obligation, end of year 130.5 162.3 $ 155.6
Change in Plan Assets      
Fair value of plan assets, beginning of year 116.2 108.6  
Actual return on plan assets (8.9) 11.5  
Employer contributions 5.3 4.7  
Participant contributions 0.0 0.0  
Currency translation adjustment 0.0 0.0  
Pension settlement (18.9) 0.0  
Benefits paid (8.8) (8.6)  
Fair value of plan assets, end of year 84.9 116.2 108.6
Funded status (45.6) (46.1)  
Amounts recognized in the Consolidated Balance sheet at December 31      
Pension asset 0.0 0.0  
Pension obligation (45.6) (46.1)  
Postretirement medical and other benefit obligations 0.0 0.0  
Net amount recognized $ (45.6) $ (46.1)  
Weighted-Average Assumptions      
Discount rate 4.30% 3.60%  
Expected return on plan assets (as a percent) 5.30% 4.70%  
Rate of compensation increase 0.00% 0.00%  
Non-US Pension Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year $ 89.5 $ 82.8  
Service cost 1.8 1.9  
Interest cost 2.1 2.1  
Participant contributions 0.0 0.0  
Plan amendments 0.0 0.0  
Actuarial (gain) loss (3.0) (2.2)  
Currency translation adjustment (4.6) 9.2  
Pension settlement 0.0 0.0  
Benefits paid (3.9) (4.3)  
Benefit obligation, end of year 81.9 89.5 82.8
Change in Plan Assets      
Fair value of plan assets, beginning of year 45.1 41.8  
Actual return on plan assets (1.4) 1.1  
Employer contributions 2.8 2.1  
Participant contributions 0.0 0.0  
Currency translation adjustment (2.5) 4.4  
Pension settlement 0.0 0.0  
Benefits paid (3.9) (4.3)  
Fair value of plan assets, end of year 40.1 45.1 41.8
Funded status (41.8) (44.4)  
Amounts recognized in the Consolidated Balance sheet at December 31      
Pension asset 0.0 0.0  
Pension obligation (41.8) (44.4)  
Postretirement medical and other benefit obligations 0.0 0.0  
Net amount recognized $ (41.8) $ (44.4)  
Weighted-Average Assumptions      
Discount rate 2.20% 2.20%  
Expected return on plan assets (as a percent) 2.70% 3.40%  
Rate of compensation increase 3.50% 2.60%  
Postretirement Medical and Other      
Change in Benefit Obligation      
Benefit obligation, beginning of year $ 28.9 $ 41.6  
Service cost 0.2 0.3 0.3
Interest cost 0.8 1.0 1.7
Participant contributions 0.7 1.4  
Plan amendments 0.0 (13.8)  
Actuarial (gain) loss (7.2) 2.9  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 0.0  
Benefits paid (2.7) (4.5)  
Benefit obligation, end of year 20.7 28.9 41.6
Change in Plan Assets      
Fair value of plan assets, beginning of year 0.0 0.0  
Actual return on plan assets 0.0 0.0  
Employer contributions 2.0 3.1  
Participant contributions 0.7 1.4  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 0.0  
Benefits paid (2.7) (4.5)  
Fair value of plan assets, end of year 0.0 0.0 $ 0.0
Funded status (20.7) (28.9)  
Amounts recognized in the Consolidated Balance sheet at December 31      
Pension asset 0.0 0.0  
Pension obligation 0.0 0.0  
Postretirement medical and other benefit obligations (20.7) (28.9)  
Net amount recognized $ (20.7) $ (28.9)  
Weighted-Average Assumptions      
Discount rate 4.10% 3.30%  
Expected return on plan assets (as a percent) 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00%