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Income Taxes - Unrecognized Tax Benefits (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Unrecognized tax benefits [Roll Forward]      
Balance as of beginning of period $ 26.1us-gaap_UnrecognizedTaxBenefits $ 12.9us-gaap_UnrecognizedTaxBenefits  
Additions attributable to Sealy on date of acquisition   9.2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromAcquisition  
Additions based on tax positions related to current period 24.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions 2.3us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions  
Additions for tax positions of prior years 0.5us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions 7.2us-gaap_UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions  
Expiration of statutes of limitations (3.2)us-gaap_UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations    
Settlements of uncertain tax positions with tax authorities (0.1)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities (5.5)us-gaap_UnrecognizedTaxBenefitsDecreasesResultingFromSettlementsWithTaxingAuthorities  
Balance as of end of period 47.6us-gaap_UnrecognizedTaxBenefits 26.1us-gaap_UnrecognizedTaxBenefits 12.9us-gaap_UnrecognizedTaxBenefits
Unrecognized tax benefits that would impact effective tax rate 44.6us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate 22.2us-gaap_UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate  
Interest and penalties related to unrecognized tax benefits recorded in income tax expense 1.9us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 1.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense 3.0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense
Accrued interest and penalties $ 10.3us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 11.0us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued $ 5.8us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued