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Employee Benefit Plans - Reconciliation of the Fair Values Measurements of Plan Assets Using Significant Unobservable Inputs (Level 3) from the Beginning of the Year to the End of the Year (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Reconciliation of fair value measurements of plan assets using significant observable inputs    
Fair value of plan assets, beginning of year $ 161.3  
Fair value of plan assets, end of year 125.1 $ 161.3
Insurance Group Annuity Contracts    
Reconciliation of fair value measurements of plan assets using significant observable inputs    
Fair value of plan assets, beginning of year $ 14.4 $ 14.5
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueInputsLevel3Member us-gaap:FairValueInputsLevel3Member
Actual return on assets $ (0.3)  
Benefit payments (1.3) $ (1.5)
Foreign currency impact (0.8) 1.3
Fair value of plan assets, end of year $ 12.0 $ 14.4
Defined Benefit Plan, Plan Assets, Fair Value by Hierarchy and NAV [Extensible List] us-gaap:FairValueInputsLevel3Member us-gaap:FairValueInputsLevel3Member