Acquisitions and Divestitures (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Acquisitions:
Purchase price	$ 593.0	$ 0	$ 718.3	$ 83.4
Net cash paid	593.0	0	711.8	37.2
Goodwill recorded	376.7	0	463.9	9.5
Divestitures:
Proceeds	0	0	0	35.6
Gain recognized	0	0	0	12.5
Goodwill charged off	$ 0	$ 0	$ 0	$ 4.8