Intangible Assets and Goodwill - Intangible Asset Amortization Expense (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 251.9	$ 245.5	$ 83.0
Estimated amortization expense, 2017	258.7
Estimated amortization expense, 2018	252.9
Estimated amortization expense, 2019	205.5
Estimated amortization expense, 2020	137.1
Estimated amortization expense, 2021	$ 134.8