Goodwill and Other Intangible Assets (Amortization Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Intangible Assets Excluding Goodwill [Line Items]
Intangible asset amortization expense	$ 1,437.4	$ 1,195.3	$ 814.7
Intangible asset impairment charges	80.8	68.3	31.3
Total intangible asset amortization expense (including impairment charges)	1,518.2	1,263.6	846.0
In-process research and development
Intangible Assets Excluding Goodwill [Line Items]
Intangible asset impairment charges	$ 74.6	$ 49.9	$ 31.3