Acquisitions and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Acquisitions:
Purchase price	$ 0.0	$ 593.0	$ 46.2	$ 718.3
Net cash paid	0.0	593.0	46.2	711.8
Goodwill recorded	0.0	410.2	0.0	496.3
Divestitures:
Proceeds	0.0	0.0	51.3	0.0
Gain recognized	0.0	0.0	8.2	0.0
Goodwill charged off	$ 0.0	$ 0.0	$ 17.3	$ 0.0