Business Acquisitions (Details) - USD ($) $ in Millions	Jun. 30, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 989.2	$ 928.5
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Tangible assets acquired	39.5
Intangible assets	86.5
Goodwill	64.0
Net deferred taxes	(6.8)
Other liabilities assumed	(11.6)
TOTAL CASH CONSIDERATION, NET	$ 171.6