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Goodwill - Schedule of Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Goodwill [Roll Forward]    
Balance at beginning of period $ 762.3 $ 678.4
Goodwill acquired   84.1
Currency translation adjustment 2.4 (0.2)
Balance at end of period $ 764.7 $ 762.3