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Employee Benefits Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Defined Benefit Plan Disclosure      
Payment for Other Postretirement Benefits $ 2.9 $ 2.1  
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Defined Benefit Plan Disclosure      
Fair value of deferred compensation assets 7.6   $ 8.1
Postretirement Health Coverage | Salaried VEBA      
Defined Benefit Plan Disclosure      
Maximum contribution threshold 2.9    
Payment for Other Postretirement Benefits   $ 2.9  
Accrued salaries, wages and related expenses      
Defined Benefit Plan Disclosure      
Accrued salaries, wages and related expenses $ 3.7