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Employee Benefits - Additional Information (Details) - Qualified and Nonqualified - Defined Benefit Pension Plans - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Jan. 01, 2021
Defined Benefit Plan Disclosure [Line Items]    
Contributions by employer $ 2.1  
Scenario Forecast    
Defined Benefit Plan Disclosure [Line Items]    
Deferred payments   $ 29.3