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Employee Benefits Narrative (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Defined Benefit Plan Disclosure      
Equity Securities, FV-NI, Unrealized Gain (Loss) $ 0.5    
Payment for Other Postretirement Benefits 2.1 $ 15.7  
Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring      
Defined Benefit Plan Disclosure      
Fair value of deferred compensation assets 11.0   $ 9.8
Postretirement Health Coverage | Union VEBA      
Defined Benefit Plan Disclosure      
Maximum contribution threshold   $ 12.8  
Postretirement Health Coverage | Salaried VEBA      
Defined Benefit Plan Disclosure      
Maximum contribution threshold 2.9    
Payment for Other Postretirement Benefits $ 2.1