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Classification of Net Deferred Tax Assets in Balance Sheet (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]    
Current net deferred tax assets $ 19.9us-gaap_DeferredTaxAssetsGrossCurrent $ 12.5us-gaap_DeferredTaxAssetsGrossCurrent
Current valuation allowance (1.1)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent (0.1)us-gaap_DeferredTaxAssetsValuationAllowanceCurrent
Total current net deferred tax assets 18.8us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent 12.4us-gaap_DeferredTaxAssetsLiabilitiesNetCurrent
Long-term net deferred tax asset 28.0us-gaap_DeferredTaxAssetsGrossNoncurrent 42.8us-gaap_DeferredTaxAssetsGrossNoncurrent
Long-term valuation allowance (2.7)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent (9.7)us-gaap_DeferredTaxAssetsValuationAllowanceNoncurrent
Long-term net deferred tax liability $ 25.3us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent $ 33.1us-gaap_DeferredTaxAssetsLiabilitiesNetNoncurrent