Intangible Assets, net and Goodwill - Intangible Asset Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 297.1	$ 260.0	$ 251.9
Amortization expense, 2018	284.5
Amortization expense, 2019	241.1
Amortization expense, 2020	223.6
Amortization expense, 2021	195.7
Amortization expense, 2022	$ 189.3