Income Taxes - Component of Income Taxes Expenses (Detail) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Currently payable (refundable):
U.S. federal and state	$ 7.4	$ 9.1	$ 0.9
Non-U.S.	15.2us-gaap_CurrentForeignTaxExpenseBenefit	(1.2)us-gaap_CurrentForeignTaxExpenseBenefit	42.6us-gaap_CurrentForeignTaxExpenseBenefit
Total	22.6us-gaap_CurrentIncomeTaxExpenseBenefit	7.9us-gaap_CurrentIncomeTaxExpenseBenefit	43.5us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred income taxes (benefit):
U.S. federal and state	3.8	(57.9)	34.5
Non-U.S.	6.1	(41.0)	26.8
Total	9.9	(98.9)	61.3
Provision for income taxes (benefit)	$ 32.5us-gaap_IncomeTaxExpenseBenefit	$ (91.0)us-gaap_IncomeTaxExpenseBenefit	$ 104.8us-gaap_IncomeTaxExpenseBenefit

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

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Amount of deferred income tax expense (benefit) and income tax credits.

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

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