Intangible Assets, net and Goodwill - Intangible Asset Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 260.0	$ 251.9	$ 245.5
Amortization expense, 2018	254.5
Amortization expense, 2019	240.3
Amortization expense, 2020	211.7
Amortization expense, 2021	136.9
Amortization expense, 2022	$ 131.5