XML 32 R45.htm IDEA: XBRL DOCUMENT v3.19.3
Employee Benefits Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Defined Benefit Plan Disclosure          
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     7.9   $ 10.5
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