INFORMATION BY OPERATING SEGMENT (Tables)

6 Months Ended

Mar. 31, 2015

Segment Reporting [Abstract]

Schedule of operating segment information

($ Millions)	Gas Utility		Gas Marketing		Other			Eliminations			Consolidated
Three Months Ended March 31, 2015
Operating Revenues:
Revenues from external customers	$	847.0	$	30.0	$	0.4		$	—		$	877.4
Intersegment revenues	2.0		14.1		0.5			(16.6		)	—
Total Operating Revenues	849.0		44.1		0.9			(16.6		)	877.4
Operating Expenses:
Gas Utility
Natural and propane gas	499.1		—		—			(16.3		)	482.8
Other operation and maintenance	104.0		—		—			(0.2		)	103.8
Depreciation and amortization	32.2		—		—			—			32.2
Taxes, other than income taxes	55.7		—		—			—			55.7
Total Gas Utility Operating Expenses	691.0		—		—			(16.5		)	674.5
Gas Marketing	—		43.5		—			—			43.5
Other	—		—		1.8			(0.1		)	1.7
Total Operating Expenses	691.0		43.5		1.8			(16.6		)	719.7
Operating Income (Loss)	$	158.0	$	0.6	$	(0.9	)	$	—		$	157.7
Net Economic Earnings (Loss)	$	96.5	$	2.1	$	(1.0	)	$	—		$	97.6
Three Months Ended March 31, 2014
Operating Revenues:
Revenues from external customers	$	634.4	$	59.9	$	0.2		$	—		$	694.5
Intersegment revenues	4.2		20.6		0.6			(25.4		)	—
Total Operating Revenues	638.6		80.5		0.8			(25.4		)	694.5
Operating Expenses:
Gas Utility
Natural and propane gas	430.5		—		—			(25.2		)	405.3
Other operation and maintenance	72.2		—		—			(0.2		)	72.0
Depreciation and amortization	20.1		—		—			—			20.1
Taxes, other than income taxes	41.8		—		—			—			41.8
Total Gas Utility Operating Expenses	564.6		—		—			(25.4		)	539.2
Gas Marketing	—		65.0		—			—			65.0
Other	—		—		3.1			—			3.1
Total Operating Expenses	564.6		65.0		3.1			(25.4		)	607.3
Operating Income (Loss)	$	74.0	$	15.5	$	(2.3	)	$	—		$	87.2
Net Economic Earnings (Loss)	$	44.7	$	7.1	$	(0.1	)	$	—		$	51.7

($ Millions)	Gas Utility		Gas Marketing		Other			Eliminations			Consolidated
Six Months Ended March 31, 2015
Operating Revenues:
Revenues from external customers	$	1,428.4	$	67.8	$	0.8		$	—		$	1,497.0
Intersegment revenues	3.0		38.5		1.0			(42.5		)	—
Total Operating Revenues	1,431.4		106.3		1.8			(42.5		)	1,497.0
Operating Expenses:
Gas Utility
Natural and propane gas	828.9		—		—			(41.8		)	787.1
Other operation and maintenance	201.4		—		—			(0.5		)	200.9
Depreciation and amortization	64.2		—		—			—			64.2
Taxes, other than income taxes	93.7		—		—			—			93.7
Total Gas Utility Operating Expenses	1,188.2		—		—			(42.3		)	1,145.9
Gas Marketing	—		102.1		—			—			102.1
Other	—		—		4.2			(0.2		)	4.0
Total Operating Expenses	1,188.2		102.1		4.2			(42.5		)	1,252.0
Operating Income (Loss)	$	243.2	$	4.2	$	(2.4	)	$	—		$	245.0
Net Economic Earnings (Loss)	$	146.3	$	2.5	$	(5.5	)	$	—		$	143.3
Six Months Ended March 31, 2014
Operating Revenues:
Revenues from external customers	$	1,069.6	$	93.1	$	0.4		$	—		$	1,163.1
Intersegment revenues	4.3		40.1		1.0			(45.4		)	—
Total Operating Revenues	1,073.9		133.2		1.4			(45.4		)	1,163.1
Operating Expenses:
Gas Utility
Natural and propane gas	692.1		—		—			(45.0		)	647.1
Other operation and maintenance	134.7		—		—			(0.4		)	134.3
Depreciation and amortization	40.1		—		—			—			40.1
Taxes, other than income taxes	70.4		—		—			—			70.4
Total Gas Utility Operating Expenses	937.3		—		—			(45.4		)	891.9
Gas Marketing	—		116.8		—			—			116.8
Other	—		—		4.3			—			4.3
Total Operating Expenses	937.3		116.8		4.3			(45.4		)	1,013.0
Operating Income (Loss)	$	136.6	$	16.4	$	(2.9	)	$	—		$	150.1
Net Economic Earnings (Loss)	$	80.5	$	7.9	$	(0.4	)	$	—		$	88.0

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

	March 31,			September 30,
($ Millions)	2015			2014
Total Assets:
Gas Utility	$	4,615.6		$	4,520.0
Gas Marketing	131.7			156.7
Other	1,590.8			1,575.7
Eliminations	(1,157.4		)	(1,178.4		)
Total Assets	$	5,180.7		$	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 March 31,						Six Months Ended March 31,
($ Millions)	2015			2014			2015			2014
Net income (GAAP)	$	94.4		$	52.2		$	141.5		$	87.8
Unrealized loss (gain) on energy-related derivative contracts	2.6			(1.7		)	(0.4		)	(1.3		)
Lower of cost or market inventory adjustments	(1.0		)	(0.5		)	0.2			(0.6		)
Realized loss (gain) on economic hedges prior to sale of the physical commodity	0.1			(0.1		)	0.1			(0.1		)
Acquisition, divestiture and restructuring activities	1.5			1.8			1.9			2.2
Net Economic Earnings (Non-GAAP)	$	97.6		$	51.7		$	143.3		$	88.0