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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Goodwill      
Balance at the beginning of the period $ 169.8 $ 130.6 $ 130.6
Current period additions/adjustments 109.0 33.8 1.0
Foreign currency effect (3.1) 5.4 (1.0)
Balance at the end of the period $ 275.7 $ 169.8 $ 130.6