Income Taxes - Income Tax Data from Continuing Operations (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income (loss) components:
United States	$ 44.5	$ 28.5	$ 33.0
International	217.5	152.0	116.1
Income from continuing operations before income tax	262.0	180.5	149.1
Current income tax expense (benefit):
United States - federal	16.2us-gaap_CurrentFederalTaxExpenseBenefit	10.6us-gaap_CurrentFederalTaxExpenseBenefit	(32.6)us-gaap_CurrentFederalTaxExpenseBenefit
United States - state and local	0.7	4.2	(8.7)
International	54.6us-gaap_CurrentForeignTaxExpenseBenefit	39.6us-gaap_CurrentForeignTaxExpenseBenefit	46.8us-gaap_CurrentForeignTaxExpenseBenefit
Total current income tax expense (benefit)	71.5us-gaap_CurrentIncomeTaxExpenseBenefit	54.4us-gaap_CurrentIncomeTaxExpenseBenefit	5.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income tax expense (benefit) components:
United States - federal	(0.6)	(331.2)	40.1
United States - state and local	5.1	(36.7)	9.9
International	(4.7)	3.9	(15.9)
Total deferred income tax expense (benefit)	(0.2)us-gaap_DeferredIncomeTaxExpenseBenefit	(364.0)us-gaap_DeferredIncomeTaxExpenseBenefit	34.1us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax expense (benefit)	$ 71.3us-gaap_IncomeTaxExpenseBenefit	$ (309.6)us-gaap_IncomeTaxExpenseBenefit	$ 39.6us-gaap_IncomeTaxExpenseBenefit
Effective income tax rate	27.20%	(171.50%)	26.60%

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

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The portion of earnings or loss from continuing operations before income taxes that is attributable to foreign operations, which is defined as Income or Loss generated from operations located outside the entity's country of domicile.

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