Goodwill and Other Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill acquired	$ 708.7	$ 88.5
Year to date amortization expense	68.9	$ 34.9	$ 32.3
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]
Amortization expense, 2019	71.9
Amortization expense, 2020	71.2
Amortization expense, 2021	69.5
Amortization expense, 2022	64.2
Amortization expense, 2023	$ 59.6