Acquisitions & Divestitures Supplemental Proforma Results of Operations (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Business Acquisition [Line Items]
Net income	$ (76.3)	$ (92.3)	$ (131.9)	$ (52.6)
Earnings Per Share, Basic	$ (0.43)	$ (0.51)	$ (0.75)	$ (0.29)
Earnings Per Share, Diluted	$ (0.43)	$ (0.51)	$ (0.75)	$ (0.29)
Business Acquisition, Pro Forma Revenue				$ 1,730.8
Business Acquisition, Pro Forma Net Income (Loss)				$ (45.6)
Business Acquisition, Pro Forma Earnings Per Share, Basic				$ (0.25)
Business Acquisition, Pro Forma Earnings Per Share, Diluted				$ (0.25)
Continuing Operations [Member]
Business Acquisition [Line Items]
Total Revenues	$ 608.6	$ 887.2	$ 1,100.2	$ 1,704.7
Net income	$ (76.3)	$ (92.3)	$ (131.9)	$ (52.6)