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Goodwill - Schedule of Pro Forma Financial Information (Detail) (USD $)
In Millions, except Per Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Goodwill and Intangible Assets Disclosure [Abstract]    
Net sales $ 1,046.2us-gaap_BusinessAcquisitionsProFormaRevenue $ 991.2us-gaap_BusinessAcquisitionsProFormaRevenue
Net income $ 77.0us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss $ 72.3us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss
Earnings per share - basic $ 3.16us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic $ 3.06us-gaap_BusinessAcquisitionProFormaEarningsPerShareBasic
Earnings per share - diluted $ 3.10us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted $ 2.99us-gaap_BusinessAcquisitionProFormaEarningsPerShareDiluted