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Income Taxes - Provision for Income Tax (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended		8 Months Ended	9 Months Ended		1 Months Ended
	Sep. 30, 2012 Successor [Member]	Sep. 30, 2011 Successor [Member]	Sep. 30, 2011 Successor [Member]	Sep. 30, 2012 Successor [Member]	Sep. 30, 2011 Successor [Member]	Jan. 31, 2011 Predecessor [Member]
Schedule Of Income Taxes [Line Items]
Income tax benefit (provision)	$ 38.0	$ 9.0	$ (3.3)	$ 127.5	$ (3.3)	$ (0.7)
Income (Loss) from Continuing Operations before Income Taxes	$ (56.0)	$ 89.9	$ 178.6	$ 1,097.2	$ 178.6	$ 632.2
Effective Tax Rate	67.90%	(10.00%)	1.80%	(11.60%)		0.10%

- Definition

A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations.

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- Definition

The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations.

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