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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Change in the carrying amount of goodwill      
Balance at the beginning of the period $ 1,691.6us-gaap_Goodwill $ 1,314.6us-gaap_Goodwill $ 1,244.3us-gaap_Goodwill
Acquisitions 51.3us-gaap_GoodwillAcquiredDuringPeriod 382.4us-gaap_GoodwillAcquiredDuringPeriod 68.0us-gaap_GoodwillAcquiredDuringPeriod
Consolidation of a joint venture entity 15.2rs_GoodwillAcquiredDuringPeriodConsolidationOfJointVenture    
Purchase price allocation adjustments 2.1us-gaap_GoodwillPurchaseAccountingAdjustments    
Sale of business (17.1)us-gaap_GoodwillWrittenOffRelatedToSaleOfBusinessUnit    
Effect of foreign currency translation (6.7)us-gaap_GoodwillTranslationAdjustments (5.4)us-gaap_GoodwillTranslationAdjustments 2.3us-gaap_GoodwillTranslationAdjustments
Accumulated impairment losses 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss    
Balance at the end of the period $ 1,736.4us-gaap_Goodwill $ 1,691.6us-gaap_Goodwill $ 1,314.6us-gaap_Goodwill