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Post Retirement Benefit Plans - Changes in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Change in benefit obligation:      
Benefit obligation at beginning of year $ 216.7 $ 228.0  
Service cost 6.4 7.5 $ 7.8
Interest cost 2.6 2.0 1.7
Plan participant contributions 4.8 4.3  
Plan amendments   (1.3)  
Plan settlements   (0.4)  
Benefits paid (2.8) (2.0)  
Actuarial loss (gain) 25.8 (16.2)  
Premiums paid (1.6) (1.7)  
Impact of foreign currency exchange rates 3.1 (3.5)  
Benefit obligation at end of year 255.0 216.7 228.0
Change in plan assets:      
Fair value of plan assets at beginning of year 124.6 120.3  
Return on plan assets (2.5) (0.6)  
Plan participant and employer contributions 11.6 10.2  
Benefits paid (2.8) (2.2)  
Plan settlements   (0.4)  
Premiums paid (1.7) (1.5)  
Impact of foreign currency exchange rates 2.2 (1.2)  
Fair value of plan assets at end of year 131.4 124.6 120.3
Net under funded status (123.6) (92.1)  
Interest and other income (expense), net (20.5) (17.7) $ (21.7)
Accumulated benefit obligation $ 243.6 $ 206.9