Income Taxes (Details) - USD ($) $ in Millions		3 Months Ended		6 Months Ended
	Jan. 01, 2017	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Income Tax Expense		$ (23.6)	$ (10.1)	$ (41.2)	$ (43.3)
Income (Loss) before Income Taxes and Equity Income of Unconsolidated Entities		65.1	87.4	119.3	$ 177.7
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount			$ (22.4)
Discrete tax benefit, reduction of long-term deferred tax liability	$ (39.1)			(2.0)
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward						$ 351.0
Minimum
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		280.0		280.0
Maximum
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		330.0		330.0
Retained Earnings [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryforward		$ 107.0		$ 107.0