Goodwill and Intangible Assets, Net - Estimated Amortization Expense (Details) $ in Millions	Dec. 31, 2017 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization expense, Less than 1 Year	$ 164.9
Amortization expense, 1-2 Years	147.7
Amortization expense, 2-3 Years	144.5
Amortization expense, 3-4 Years	144.1
Amortization expense, 4-5 Years	61.5
Amortization expense, Thereafter	$ 75.1