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Pension Benefits - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
employees
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Defined Benefit Plan Disclosure [Line Items]      
Defined contribution plan, cost $ 28.9 $ 26.1 $ 26.0
Payment for Pension Benefits $ 0.0 0.0 55.3
Pension and Other Postretirement Benefits Expense (Reversal of Expense), Noncash   50.6  
Pension Plans, Defined Benefit      
Defined Benefit Plan Disclosure [Line Items]      
Number of participants and beneficiaries | employees 3,145    
Contribution as a percentage of compensation 3.00%    
Actuarial loss amortization period 27 years    
Amounts that will be amortized from AOCI in next fiscal Year $ 3.7    
Employer Contributions 0.0 0.0  
Unfunded liability (12.9) (23.1)  
Pension expense 0.6 58.6 (5.4)
Unrecognized pension gain (loss) arising during the year 6.0 7.8 (4.2)
Payment for Pension Benefits   117.1  
Supplemental Employee Retirement Plan      
Defined Benefit Plan Disclosure [Line Items]      
Unfunded liability 28.0 30.7  
Pension expense 0.7 0.8 1.0
Unrecognized pension gain (loss) arising during the year $ 1.3 (2.7) $ (5.6)
Terminal Funding Annuity      
Defined Benefit Plan Disclosure [Line Items]      
Proceeds from Annuities and Investment Certificates   $ 205.4