Business Combinations, Purchase Price Allocation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 2,981.5	$ 4,057.7	$ 2,981.3
2014 Acquisitions [Member]
Business Acquisition [Line Items]
Net tangible assets acquired	0.0
Net tangible liabilities acquired	(2.7)
Intangible assets acquired	17.8
Goodwill	13.6
Consideration transferred	$ 28.7
2013 Acquisitions [Member]
Business Acquisition [Line Items]
Net tangible assets acquired		0.1
Net tangible liabilities acquired		0.0
Intangible assets acquired		9.9
Goodwill		0.0
Consideration transferred		$ 10.0