Acquisitions & Divestitures Supplemental Proforma Results of Operations (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Business Acquisition [Line Items]
Total Revenues	$ 883.9	$ 696.5
Net Income (Loss) Attributable to Parent	39.7	(4.3)
Earnings Per Share, Basic	$ 0.22	$ (0.02)
Earnings Per Share, Diluted	$ 0.22	$ (0.02)
Business Acquisition, Pro Forma Revenue	910.0	731.0
Business Acquisition, Pro Forma Net Income (Loss)	$ 46.7	$ 3.6
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.26	$ 0.02
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.26	$ 0.02