Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 405.5	$ 392.3
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	29.5	30.0
Total intangible asset amortization expense (including impairment charges)	$ 435.0	$ 422.3