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Income Taxes (Details 3) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Tax computed at federal statutory rate									$ (3.8)	$ 133.8	$ 142.5
State income taxes, net of federal tax benefit									(8.0)	11.7	14.0
State tax incentives, net of federal tax expense									(8.8)	(7.2)	(5.4)
Domestic production activities deduction									(4.3)	(5.9)	(5.5)
Non-deductible share-based compensation									0.0	0.0	0.2
Noncontrolling interest									5.5	(44.9)	(47.4)
Other, net									(0.4)	(3.0)	(0.7)
Total income tax expense (benefit)	$ (22.1)	$ 2.5	$ 21.6	$ (21.8)	$ (20.7)	$ 23.1	$ 58.1	$ 24.0	$ (19.8)	$ 84.5	$ 97.7

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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 the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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