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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 | $ 1,691.6 us-gaap_Goodwill | $ 1,314.6 us-gaap_Goodwill | $ 1,244.3 us-gaap_Goodwill
Acquisitions | 51.3 us-gaap_GoodwillAcquiredDuringPeriod | 382.4 us-gaap_GoodwillAcquiredDuringPeriod | 68.0 us-gaap_GoodwillAcquiredDuringPeriod
Consolidation of a joint venture entity | 15.2 rs_GoodwillAcquiredDuringPeriodConsolidationOfJointVenture |  |
Purchase price allocation adjustments | 2.1 us-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 | 2.3 us-gaap_GoodwillTranslationAdjustments
Accumulated impairment losses | 0 us-gaap_GoodwillImpairedAccumulatedImpairmentLoss |  |
Balance at the end of the period | $ 1,736.4 us-gaap_Goodwill | $ 1,691.6 us-gaap_Goodwill | $ 1,314.6 us-gaap_Goodwill

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- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266 + Details
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- Details
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