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Supplemental Information Relating to Oil and Natural Gas Producing Activities (Unaudited) - Schedule of Changes in Standardized Measure of Discounted Future Net Cash Flows (Details) (USD $) In Millions, unless otherwise specified	7 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2014
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Purchase of reserves in place	$ 300.6	$ 0
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves	(20.8)	(44.6)
Net change	302.3	43.5
Compass
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Sales and transfers of oil and natural gas produced	(46.2)	77.4
Net changes in prices and production costs	39.2	141.8
Extensions and discoveries, net of future development and production costs	8.1	3.5
Development costs during the period	7.4	(10.0)
Changes in estimated future development costs	20.2	(12.0)
Revisions of previous quantity estimates	(50.2)	24.2
Accretion of discount before income taxes	16.1	32.3
Changes in timing and other	$ 27.9	$ (34.3)

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of passage of time.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of extensions, discoveries and improved recovery of proved oil and gas reserves.

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Amount of increase (decrease) in standardized measure of discounted future net cash flow as a result of revisions of estimated quantity of oil and gas in proved reserves.

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