Business Acquisitions (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Goodwill	$ 992.4	$ 928.5
Series of Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Tangible assets acquired	40.1
Intangible assets	86.1
Goodwill	64.7
Net deferred taxes	(6.3)
Other liabilities assumed	(12.4)
TOTAL CASH CONSIDERATION, NET	$ 172.2