Income Taxes - Components of Comprehensive Provision for Income Taxes Allocation (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Schedule Of Income Tax [Line Items]
Expected tax expense, at U.S. federal statutory income tax rate of 35%	$ 7.6	$ 2.9
Incremental tax (benefit) on earnings of non-U.S. and non-tax group companies	0.5	(0.1)
Non-U.S. tax rates	(1.1)	(0.7)
Adjustment to the reserve for uncertain tax positions, net	(2.7)	0.3
Nondeductible expenses	0.5	0.4
Domestic manufacturing credit	(0.8)	(0.1)
U.S. state income taxes and other, net	0.3	1.1
Income tax expense	4.3us-gaap_IncomeTaxExpenseBenefit	3.8us-gaap_IncomeTaxExpenseBenefit
Comprehensive provision for income taxes allocable to:
Net income	4.3us-gaap_IncomeTaxExpenseBenefit	3.8us-gaap_IncomeTaxExpenseBenefit
Other comprehensive income (loss):
Marketable securities	(0.2)	(8.8)
Currency translation	(16.2)	(0.7)
Total	(11.0)	(4.9)
Defined Benefit Pension Plans
Other comprehensive income (loss):
Defined benefit plans	1.3	1.0
OPEB
Other comprehensive income (loss):
Defined benefit plans	$ (0.2)	$ (0.2)

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

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from 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 increase (decrease) in income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies.

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Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss.

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Amount of tax expense (benefit), after reclassification adjustments of gain (loss) on foreign currency translation adjustments, foreign currency transactions designated and effective as economic hedges of a net investment in a foreign entity and intra-entity foreign currency transactions that are of a long-term-investment nature.

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Amount of tax (expense) benefit, after reclassification adjustments, of (increase) decrease in accumulated other comprehensive (income) loss related to pension and other postretirement defined benefit plans.

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

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Incremental tax expense (benefit) on earnings of non US and non tax group companies.

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