Acquisitions & Divestitures Pro Forma (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
Mar. 31, 2017	Mar. 31, 2016
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss)	$ 76.9	$ (863.8)
Earnings Per Share, Basic	$ 0.32	$ (4.55)
Earnings Per Share, Diluted	$ 0.32	$ (4.55)
Revenues	$ 420.1	$ 261.3
2016 Permian Basin Acquisition [Member]
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Net income (loss)		$ (863.8)
Earnings Per Share, Basic		$ (4.55)
Earnings Per Share, Diluted		$ (4.55)
Pro Forma Revenue		$ 265.9
Pro Forma Net Income (Loss)		$ (864.6)
Pro Forma Earnings Per Share, Basic		$ (4.56)
Pro Forma Earnings Per Share, Diluted		$ (4.56)
Revenues		$ 261.3

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

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