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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Change in the carrying amount of goodwill  
Balance at the beginning of the period $ 1,736.4us-gaap_Goodwill
Acquisition 0.3us-gaap_GoodwillAcquiredDuringPeriod
Purchase price allocation adjustment (0.4)us-gaap_GoodwillPurchaseAccountingAdjustments
Effect of foreign currency translation (6.0)us-gaap_GoodwillTranslationAdjustments
Balance at the end of the period 1,730.3us-gaap_Goodwill
Accumulated impairment losses $ 0us-gaap_GoodwillImpairedAccumulatedImpairmentLoss