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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Sum of operating profit and nonoperating income or expense before Income or Loss from equity method investments, income taxes, extraordinary items, and noncontrolling interest.

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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 valuation allowance for deferred tax assets.

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from 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 noncontrolling interest income (loss) exempt from income taxes.

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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 tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Income Taxes - Income Tax Reconciliation (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]
Income (loss) before income taxes	$ (490.9)	$ 554.8	$ 419.0	$ 302.3	$ 627.6	$ 420.0	$ (75.2)	$ (214.3)	$ 785.2	$ 758.1	$ 606.0
Tax rate									35.00%	35.00%	35.00%
Income tax expense (benefit) at federal statutory rate									274.8	265.3	212.1
Valuation allowance									(1,850.0)	(86.6)	(48.3)
Dividends received deduction									(99.0)	(119.3)	(101.3)
Audit settlement									(1.7)	(4.1)	(4.3)
State tax expense (benefit)									2.0	5.9	(8.8)
Noncontrolling interest									(83.2)	(66.5)	(48.4)
Tax credits									1.8	(14.8)	(19.6)
Non-deductible expenses									1.2	(14.6)	14.2
Other									1.9	2.2	(0.8)
Total income tax expense (benefit)									$ (1,752.2)us-gaap_IncomeTaxExpenseBenefit	$ (32.5)us-gaap_IncomeTaxExpenseBenefit	$ (5.2)us-gaap_IncomeTaxExpenseBenefit