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Income Taxes - Components of Loss Income Before Income Taxes and Noncontrolling Interests (Detail) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Schedule of Income Before Income Tax [Line Items]      
Domestic operations $ 301.4us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 243.8us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 77.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Foreign operations 90.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 66.7us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 58.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income from continuing operations before income taxes $ 391.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 310.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 135.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments