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Income Taxes - Pre-tax Income Attributable to Operating Segments (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income before income taxes:      
United States $ 46.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ (4.5)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic $ 126.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic
Rest of the world 128.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 132.5us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign 103.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign
Income before income taxes $ 174.9us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 128.0us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments $ 229.2us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments