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Goodwill (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Change in the carrying amount of goodwill      
Balance at the beginning of the period $ 2,003.8 $ 1,870.8 $ 1,842.6
Acquisitions 6.9 131.8 33.8
Purchase price allocation adjustments (77.2) (1.9)  
Effect of foreign currency translation 1.7 3.1 (5.6)
Balance at the end of the period 1,935.2 $ 2,003.8 $ 1,870.8
Accumulated impairment losses $ 0.0