Business Acquisitions (Details) - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 928.5	$ 874.7
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Tangible assets acquired	36.8
Intangible assets	81.7
Goodwill	54.5
Other liabilities assumed	(9.9)
TOTAL CASH CONSIDERATION, NET	$ 163.1