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Income Taxes (Details 3) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Tax Disclosure [Abstract]
Tax computed at federal statutory rate									$ 133.8	$ 142.5	$ 247.0
State income taxes, net of federal tax benefit									11.7	14.0	16.5
State tax incentives, net of federal tax expense									(7.2)	(5.4)	(9.0)
Domestic production activities deduction									(5.9)	(5.5)	(18.5)
Non-deductible share-based compensation									0.0	0.2	1.5
Noncontrolling interest									(44.9)	(47.4)	(53.0)
Other, net									(3.0)	(0.7)	(0.8)
Total income tax expense	$ (20.7)	$ 23.1	$ 58.1	$ 24.0	$ (21.0)	$ 4.2	$ 45.2	$ 69.4	$ 84.5	$ 97.7	$ 183.7

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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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