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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, 2015
Dec. 31, 2014
US Pension Plans    
Employee benefit plans    
Projected benefit obligation $ 218.5 $ 235.9
Accumulated benefit obligation 218.5 235.9
Fair value of plan assets 143.9 160.0
Non-US Pension Plans    
Employee benefit plans    
Projected benefit obligation 252.5 274.8
Accumulated benefit obligation 244.9 269.9
Fair value of plan assets $ 196.9 $ 210.1