Income Taxes - Classification Of Net Defered Income Tax Assets (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets:
Current	$ 210.8us-gaap_DeferredTaxAssetsNetCurrent	$ 187.4us-gaap_DeferredTaxAssetsNetCurrent
Long-term	606.4us-gaap_DeferredTaxAssetsNetNoncurrent	535.9us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred income tax liabilities:
Current	(9.6)us-gaap_DeferredTaxLiabilitiesCurrent	(23.1)us-gaap_DeferredTaxLiabilitiesCurrent
Long-term	(57.2)	(61.1)
Deferred Tax Assets, Net	$ 750.4us-gaap_DeferredTaxAssetsLiabilitiesNet	$ 639.1us-gaap_DeferredTaxAssetsLiabilitiesNet

Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards expected to be realized or consumed within one year or operating cycle, if longer.

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Amount after allocation of valuation allowances of noncurrent deferred tax asset attributable to deductible temporary differences and carryforwards. Noncurrent assets are expected to be realized or consumed after one year (or the normal operating cycle, if longer).

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- Definition

Amount of deferred tax liability attributable to taxable temporary differences, net of deferred tax asset attributable to deductible temporary differences and carryforwards net of valuation allowances expected to be realized or consumed within one year or operating cycle, if longer.

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