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Income Taxes - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Jun. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 State and Local Jurisdiction [Member]	Dec. 31, 2013 State and Local Jurisdiction [Member]	Sep. 30, 2014 Foreign Tax Authority [Member]	Dec. 31, 2013 Foreign Tax Authority [Member]
Valuation Allowance [Line Items]
Income tax (expense) benefit	$ (8.5)	$ (0.5)		$ (18.4)	$ 100.7
Effective tax rate	35.90%	2.90%		31.60%	(307.00%)
Valuation Allowance, Deferred Tax Asset, Release Allowed			102.4
Deferred Tax Assets, Valuation Allowance						4.1	4.7	4.7	5.1
Unrecognized Tax Benefits, Period Increase (Decrease)	$ (1.1)

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Valuation Allowance, Deferred Tax Asset, Release Allowed

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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