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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, 2018
Dec. 31, 2017
U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation $ 130.5 $ 162.3
Accumulated benefit obligation 130.5 162.3
Fair value of plan assets 84.9 116.2
Non-U.S. Pension Plans    
Defined Benefit Plan Disclosure [Line Items]    
Projected benefit obligation 81.9 85.6
Accumulated benefit obligation 78.1 82.1
Fair value of plan assets $ 40.1 $ 41.6