INFORMATION BY OPERATING SEGMENT (Tables)

9 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Schedule of operating segment information

($ Millions)	Gas Utility		Gas Marketing		Other			Eliminations			Consolidated
Three Months Ended June 30, 2015
Operating Revenues:
Revenues from external customers	$	260.2	$	14.5	$	0.5		$	—		$	275.2
Intersegment revenues	1.0		14.4		0.5			(15.9		)	—
Total Operating Revenues	261.2		28.9		1.0			(15.9		)	275.2
Operating Expenses:
Gas Utility
Natural and propane gas	73.2		—		—			(15.5		)	57.7
Other operation and maintenance	90.9		—		—			(0.3		)	90.6
Depreciation and amortization	32.5		—		—			—			32.5
Taxes, other than income taxes	26.2		—		—			—			26.2
Total Gas Utility Operating Expenses	222.8		—		—			(15.8		)	207.0
Gas Marketing	—		27.4		—			—			27.4
Other	—		—		4.9			(0.1		)	4.8
Total Operating Expenses	222.8		27.4		4.9			(15.9		)	239.2
Operating Income (Loss)	$	38.4	$	1.5	$	(3.9	)	$	—		$	36.0
Net Economic Earnings (Loss)	$	16.5	$	0.5	$	(5.9	)	$	—		$	11.1
Three Months Ended June 30, 2014
Operating Revenues:
Revenues from external customers	$	214.0	$	27.1	$	0.7		$	—		$	241.8
Intersegment revenues	0.2		27.9		0.5			(28.6		)	—
Total Operating Revenues	214.2		55.0		1.2			(28.6		)	241.8
Operating Expenses:
Gas Utility
Natural and propane gas	77.6		—		—			(28.3		)	49.3
Other operation and maintenance	73.3		—		—			(0.3		)	73.0
Depreciation and amortization	18.4		—		—			—			18.4
Taxes, other than income taxes	22.2		—		—			—			22.2
Total Gas Utility Operating Expenses	191.5		—		—			(28.6		)	162.9
Gas Marketing	—		50.0		—			—			50.0
Other	—		—		4.2			—			4.2
Total Operating Expenses	191.5		50.0		4.2			(28.6		)	217.1
Operating Income (Loss)	$	22.7	$	5.0	$	(3.0	)	$	—		$	24.7
Net Economic Earnings (Loss)	$	13.3	$	1.9	$	(0.7	)	$	—		$	14.5

($ Millions)	Gas Utility		Gas Marketing		Other			Eliminations			Consolidated
Nine Months Ended June 30, 2015
Operating Revenues:
Revenues from external customers	$	1,688.6	$	82.3	$	1.3		$	—		$	1,772.2
Intersegment revenues	4.0		52.9		1.5			(58.4		)	—
Total Operating Revenues	1,692.6		135.2		2.8			(58.4		)	1,772.2
Operating Expenses:
Gas Utility
Natural and propane gas	902.1		—		—			(57.3		)	844.8
Other operation and maintenance	292.3		—		—			(0.8		)	291.5
Depreciation and amortization	96.7		—		—			—			96.7
Taxes, other than income taxes	119.9		—		—			—			119.9
Total Gas Utility Operating Expenses	1,411.0		—		—			(58.1		)	1,352.9
Gas Marketing	—		129.5		—			—			129.5
Other	—		—		9.1			(0.3		)	8.8
Total Operating Expenses	1,411.0		129.5		9.1			(58.4		)	1,491.2
Operating Income (Loss)	$	281.6	$	5.7	$	(6.3	)	$	—		$	281.0
Net Economic Earnings (Loss)	$	162.8	$	3.0	$	(11.4	)	$	—		$	154.4
Nine Months Ended June 30, 2014
Operating Revenues:
Revenues from external customers	$	1,283.6	$	120.2	$	1.1		$	—		$	1,404.9
Intersegment revenues	4.5		68.0		1.5			(74.0		)	—
Total Operating Revenues	1,288.1		188.2		2.6			(74.0		)	1,404.9
Operating Expenses:
Gas Utility
Natural and propane gas	769.7		—		—			(73.3		)	696.4
Other operation and maintenance	208.0		—		—			(0.7		)	207.3
Depreciation and amortization	58.5		—		—			—			58.5
Taxes, other than income taxes	92.6		—		—			—			92.6
Total Gas Utility Operating Expenses	1,128.8		—		—			(74.0		)	1,054.8
Gas Marketing	—		166.8		—			—			166.8
Other	—		—		8.5			—			8.5
Total Operating Expenses	1,128.8		166.8		8.5			(74.0		)	1,230.1
Operating Income (Loss)	$	159.3	$	21.4	$	(5.9	)	$	—		$	174.8
Net Economic Earnings (Loss)	$	93.8	$	9.8	$	(1.1	)	$	—		$	102.5

The Company's total assets by segment were as follows:

	June 30,			September 30,
($ Millions)	2015			2014
Total Assets:
Gas Utility	$	4,480.1		$	4,520.0
Gas Marketing	151.2			156.7
Other	1,560.6			1,575.7
Eliminations	(1,109.0		)	(1,178.4		)
Total Assets	$	5,082.9		$	5,074.0

Schedule of the reconciliation of consolidated net economic earnings to consolidated net income

The following table reconciles the Company's Net Income (GAAP) to Net Economic Earnings (Non-GAAP):

	Three Months Ended June 30,						Nine Months Ended June 30,
($ Millions)	2015			2014			2015			2014
Net Income (GAAP)	$	14.1		$	11.7		$	155.6		$	99.5
Unrealized loss (gain) on energy-related derivative contracts	(1.7		)	(1.0		)	(2.1		)	(2.3		)
Lower of cost or market inventory adjustments	(0.2		)	(0.1		)	—			(0.7		)
Realized loss (gain) on economic hedges prior to sale of the physical commodity	1.5			—			1.6			(0.1		)
Acquisition, divestiture and restructuring activities	2.1			3.9			4.0			6.1
Gain on sale of property	(4.7		)	—			(4.7		)	—
Net Economic Earnings (Non-GAAP)	$	11.1		$	14.5		$	154.4		$	102.5