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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Change in the carrying amount of goodwill      
Balance at the beginning of the period $ 1,314.6 $ 1,244.3 $ 1,109.6
Acquisitions 382.4 68.0 138.5
Purchase price allocation adjustments     0.2
Effect of foreign currency translation (5.4) 2.3 (4.0)
Balance at the end of the period 1,691.6 1,314.6 1,244.3
Accumulated impairment losses $ 0