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Pensions - Summary of Changes in Projected Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year $ 179.0 $ 180.6  
Service cost 0.0 0.0 $ 0.0
Interest cost 6.4 7.6 7.8
Actuarial (gain) loss (13.9) 12.9  
Benefits and expenses paid (9.9) (8.4)  
Settlement payments 0.0 (13.7)  
Amendments 0.0 0.0  
Foreign currency translation 0.0 0.0  
Benefit obligation, end of year 161.6 179.0 180.6
Accumulated benefit obligation, end of year 161.6 179.0  
Non-U.S. Benefit Plan      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Benefit obligation, beginning of year 54.7 51.7  
Service cost 0.2 0.2 0.2
Interest cost 1.3 1.4 1.8
Actuarial (gain) loss (2.2) (0.1)  
Benefits and expenses paid (3.8) (3.3)  
Settlement payments 0.0 0.0  
Amendments 2.6 [1] 0.0  
Foreign currency translation (3.0) 4.8  
Benefit obligation, end of year 49.8 54.7 $ 51.7
Accumulated benefit obligation, end of year $ 49.8 $ 54.7  
[1] While the non-U.S. benefit plan has not yet been amended, this component of the change to the benefit obligation of the non-U.S. benefit plan during the year ended December 31, 2018 represents the estimated impact of the U.K. High Court ruling, as described above.