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Goodwill (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended
Jun. 30, 2013
Change in the carrying amount of goodwill  
Balance at the beginning of the period $ 1,314.6
Acquisition 349.1
Effect of foreign currency translation (4.9)
Balance at the end of the period 1,658.8
Accumulated impairment losses $ 0