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Income Taxes - Reconciliation of Total Income Tax Expense (Benefit) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Tax Disclosure [Abstract]
Tax computed at federal statutory rate									$ 0.0	$ (3.8)	$ 133.8
State income taxes, net of federal tax benefit									(15.7)	(8.0)	11.7
State tax incentives, net of federal tax expense									(6.9)	(8.8)	(7.2)
Domestic production activities deduction									0.0	(4.3)	(5.9)
Noncontrolling interest									6.1	5.5	(44.9)
Other, net									0.1	(0.4)	(3.0)
Adjustment to deferred tax assets and liabilities for enacted change in federal tax rate									(200.5)	0.0	0.0
Total income tax expense (benefit)	$ (234.3)	$ 9.2	$ (6.6)	$ 14.8	$ (22.1)	$ 2.5	$ 21.6	$ (21.8)	$ (216.9)	$ (19.8)	$ 84.5

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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