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Income Taxes - Allocation of Total Income Taxes (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Tax Benefit/(Loss) Applicable To: [Abstract]
Loss from continuing operations, before income taxes	$ 169.9	$ 374.2	$ 479.3	$ 777.9
Discontinued operations	(2.3)	36.1	11.0	41.2
Accumulated other comprehensive loss	$ (0.3)	$ (0.9)	$ (0.4)	$ (2.1)
Effective tax rate benefit	15.40%	34.90%	22.80%	41.90%

Tax effect allocated to a disposal group that is classified as a component of the entity reported as a separate component of income before extraordinary items. Includes the tax effects of the following: income (loss) from operations during the phase-out period, gain (loss) on disposal, provision (or any reversals of earlier provisions) for loss on disposal, and adjustments of a prior period gain (loss) on disposal.

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