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Employee Benefit Plans - Fair Value of Plan Assets for Which the Accumulated Benefit Obligation is in Excess of the Plan Assets (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
US Pension Plans    
Employee benefit plans    
Projected benefit obligation $ 155.6 $ 218.5
Accumulated benefit obligation 155.6 218.5
Fair value of plan assets 108.6 143.9
Non-US Pension Plans    
Employee benefit plans    
Projected benefit obligation 79.1 252.5
Accumulated benefit obligation 76.2 244.9
Fair value of plan assets $ 38.4 $ 196.9