Goodwill and Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of Intangible Assets	$ 387.4		$ 353.8	$ 779.7	$ 696.2
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)	42.0	$ 30.0	0.0	72.0
Total Intangible asset amortization expense (including impairment charges)	$ 429.4		$ 353.8	$ 851.7	$ 696.2