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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in Plan Assets      
Fair value of plan assets, beginning of year $ 125.0    
Fair value of plan assets, end of year 144.8 $ 125.0  
U.S. Pension Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year 130.5 162.3  
Service cost 0.0 0.0  
Interest cost 5.1 5.2  
Participant contributions 0.0 0.0  
Plan amendments 0.0 0.0  
Actuarial (gain) loss 13.8 (9.2)  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 (18.9)  
Benefits paid (7.1) (8.8)  
Benefit obligation, end of year 142.3 130.5 $ 162.3
Change in Plan Assets      
Fair value of plan assets, beginning of year 84.9 116.2  
Actual return on plan assets 16.8 (8.9)  
Employer contributions 5.0 5.3  
Participant contributions 0.0 0.0  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 (18.9)  
Benefits paid (7.1) (8.8)  
Fair value of plan assets, end of year 99.6 84.9 116.2
Funded status (42.7) (45.6)  
Amounts recognized in the Consolidated Balance sheet at December 31      
Pension asset 0.0 0.0  
Pension obligation (42.7) (45.6)  
Postretirement medical and other benefit obligations 0.0 0.0  
Net amount recognized $ (42.7) $ (45.6)  
Weighted-Average Assumptions      
Discount rate 3.30% 4.30%  
Expected return on plan assets (as a percent) 5.20% 5.30%  
Rate of compensation increase 0.00% 0.00%  
Non-US Pension Plans      
Change in Benefit Obligation      
Benefit obligation, beginning of year $ 81.9 $ 89.5  
Service cost 1.8 1.8  
Interest cost 2.2 2.1  
Participant contributions 0.0 0.0  
Plan amendments 0.0 0.0  
Actuarial (gain) loss 8.3 (3.0)  
Currency translation adjustment 1.1 (4.6)  
Pension settlement 0.0 0.0  
Benefits paid (4.7) (3.9)  
Benefit obligation, end of year 90.6 81.9 89.5
Change in Plan Assets      
Fair value of plan assets, beginning of year 40.1 45.1  
Actual return on plan assets 4.2 (1.4)  
Employer contributions 4.0 2.8  
Participant contributions 0.0 0.0  
Currency translation adjustment 1.6 (2.5)  
Pension settlement 0.0 0.0  
Benefits paid (4.7) (3.9)  
Fair value of plan assets, end of year 45.2 40.1 45.1
Funded status (45.4) (41.8)  
Amounts recognized in the Consolidated Balance sheet at December 31      
Pension asset 0.0 0.0  
Pension obligation (45.4) (41.8)  
Postretirement medical and other benefit obligations 0.0 0.0  
Net amount recognized $ (45.4) $ (41.8)  
Weighted-Average Assumptions      
Discount rate 1.50% 2.20%  
Expected return on plan assets (as a percent) 3.50% 2.70%  
Rate of compensation increase 3.60% 3.50%  
Postretirement Medical and Other      
Change in Benefit Obligation      
Benefit obligation, beginning of year $ 20.7 $ 28.9  
Service cost 0.2 0.2 0.3
Interest cost 0.8 0.8 1.0
Participant contributions 0.4 0.7  
Plan amendments 0.0 0.0  
Actuarial (gain) loss (1.5) (7.2)  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 0.0  
Benefits paid (2.2) (2.7)  
Benefit obligation, end of year 18.4 20.7 28.9
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 1.8 2.0  
Participant contributions 0.4 0.7  
Currency translation adjustment 0.0 0.0  
Pension settlement 0.0 0.0  
Benefits paid (2.2) (2.7)  
Fair value of plan assets, end of year 0.0 0.0 $ 0.0
Funded status (18.4) (20.7)  
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 (18.4) (20.7)  
Net amount recognized $ (18.4) $ (20.7)  
Weighted-Average Assumptions      
Discount rate 2.90% 4.10%  
Expected return on plan assets (as a percent) 0.00% 0.00% 0.00%
Rate of compensation increase 0.00% 0.00%