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Goodwill and Intangible Assets - Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract]          
Goodwill $ 148.5   $ 148.5   $ 148.3
Amortization of Intangible Assets $ 1.4 $ 1.3 $ 4.1 $ 4.1