Acquisitions and Divestitures (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Acquisitions:
Purchase price	$ 0.0	$ 7.7	$ 46.2	$ 125.3
Net cash paid	0.0	6.2	46.2	118.8
Goodwill recorded	0.0	5.1	0.0	87.2
Divestitures:
Proceeds	51.3	0.0	51.3	0.0
Gain recognized	7.8	0.0	7.8	0.0
Goodwill charged off	$ 17.3	$ 0.0	$ 17.3	$ 0.0