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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) $ in Millions	8 Months Ended	12 Months Ended
	Sep. 30, 2013 USD ($) $ / MMBTU	Sep. 30, 2015 USD ($) $ / MMBTU	Sep. 30, 2014 USD ($) $ / MMBTU
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Purchase of reserves in place	$ 300.6	$ (3.1)	$ 0.0
Changes in Future Income Tax Expense Estimates on Future Cash Flows Related to Proved Oil and Gas Reserves	(20.8)	65.4	(44.6)
Net change	302.3	(117.7)	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	21.5	(77.4)
Net changes in prices and production costs	39.2	(336.8)	141.8
Extensions and discoveries, net of future development and production costs	8.1	1.8	3.5
Development costs during the period	(7.4)	(12.0)	10.0
Changes in estimated future development costs	20.2	28.1	(12.0)
Revisions of previous quantity estimates	(50.2)	(44.9)	24.2
Decrease Due to Sales of Minerals in Place	0.0	138.2	0.0
Accretion of discount before income taxes	16.1	55.3	32.3
Changes in timing and other	$ 27.9	$ (12.1)	$ (34.3)
Natural Gas
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items]
Future Net Cash Flows Relating to Proved Oil and Gas Reserves, Reference Price | $ / MMBTU	3.60	3.06	4.24

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