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Employee Benefit Plans - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Defined Contribution Plans        
Total expenses   $ 17.8 $ 18.4 $ 20.0
Defined Benefit Plan        
Fair value of plan assets     280.6  
Defined benefit pension plan settlement charges $ 109.8 109.8    
Restricted cash 29.4 29.4 19.2 6.3
Benefit obligation     $ 240.7  
Discount rate assumption     1.66%  
Prepaid pension costs     $ 39.9  
Net Periodic Benefit Cost        
Net periodic benefit cost   9.4 $ 4.4 $ 4.1
Other Assets        
Defined Benefit Plan        
Restricted cash 18.4 18.4    
Investments $ 11.9 $ 11.9