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Employee Benefit Plans and Other Postretirement Benefit Plans Narrative (Details) - USD ($)
$ in Millions
Jun. 30, 2017
Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]    
Liability, Defined Benefit Pension Plan, Noncurrent $ 144.2 $ 113.5
Liability, Other Postretirement Defined Benefit Plan, Noncurrent 541.6 $ 542.6
Other Postretirement Benefits Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Plan, Expected Future Employer Contributions, Remainder of Fiscal Year $ 16.0