Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Taxes [Line Items]
Income tax benefit rate	24.60%	4.00%	19.00%	4.00%
Income tax provision (benefit)	$ 12.3	$ (48.0)	$ 22.7	$ (55.4)
Settlement of tax disputes		2		12
Increase in valuation allowances		36
Foreign
Income Taxes [Line Items]
Payments made to a foreign jurisdiction			14
Interest paid to foreign jurisdiction			$ 2

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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-Publisher FASB

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The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income.

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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 income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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Amount of interest expense for an underpayment of income taxes.

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Total increases or decreases in allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

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