Employee Benefit Plans and Other Postretirement Benefit Plans Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Pension Plan, Liabilities, Noncurrent		$ 100.7	$ 103.1
Other Postretirement Defined Benefit Plan, Liabilities, Noncurrent		$ 544.8	$ 559.0
Scenario, Forecast [Member] | Other Postretirement Benefit Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plans, Estimated Future Employer Contributions in Current Fiscal Year	$ 16.0