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Employee Benefit Plans and Other Postretirement Benefit Plans Narrative (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Pension Plan, Noncurrent $ 132.4 $ 134.7
Liability, Other Postretirement Defined Benefit Plan, Noncurrent 582.2 $ 583.0
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year 2.0  
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 17.0