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Employee Benefit Plans (Accumulated Benefit Obligation) (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 150.7 $ 151.6
Accumulated benefit obligation 150.0 150.8
Fair value of the plan assets 116.8 112.4
Non-U.S. Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 94.0 102.4
Accumulated benefit obligation 90.7 97.2
Fair value of the plan assets $ 10.4 $ 41.5