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Employee Benefit Plans - Activity of Plan Assets With Fair Value Measurement Using Significant Unobservable Inputs (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at the beginning of the year $ 190.2 $ 174.9
Foreign currency impact 13.3 0.4
Fair value of plan assets at the end of the year 209.3 190.2
Investment and Insurance Contracts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at the beginning of the year 82.6  
Fair value of plan assets at the end of the year 88.9 82.6
Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at the beginning of the year 52.0  
Fair value of plan assets at the end of the year 57.5 52.0
Level 3 | Investment and Insurance Contracts    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Fair value of plan assets at the beginning of the year 52.0 50.6
Actual return on plan assets 0.8 3.3
Purchase, sales and settlements. net (0.3) (0.9)
Foreign currency impact 5.0 (1.0)
Fair value of plan assets at the end of the year $ 57.5 $ 52.0