INFORMATION BY OPERATING SEGMENT (Tables)

6 Months Ended

Mar. 31, 2016

Segment Reporting [Abstract]

Schedule of operating segment information

	Gas Utility		Gas Marketing			Other			Eliminations			Consolidated
Three Months Ended March 31, 2016
Operating Revenues:
Revenues from external customers	$	611.5	$	(2.6	)	$	0.4		$	—		$	609.3
Intersegment revenues	1.2		10.6			0.5			(12.3		)	—
Total Operating Revenues	612.7		8.0			0.9			(12.3		)	609.3
Operating Expenses:
Gas Utility
Natural and propane gas	273.0		—			—			(11.9		)	261.1
Other operation and maintenance	94.6		—			—			(0.3		)	94.3
Depreciation and amortization	33.8		—			—			—			33.8
Taxes, other than income taxes	43.9		—			—			—			43.9
Total Gas Utility Operating Expenses	445.3		—			—			(12.2		)	433.1
Gas Marketing and Other	—		5.5			3.1			(0.1		)	8.5
Total Operating Expenses	445.3		5.5			3.1			(12.3		)	441.6
Operating Income (Loss)	$	167.4	$	2.5		$	(2.2	)	$	—		$	167.7
Net Economic Earnings (Loss)	$	102.5	$	3.0		$	(2.0	)	$	—		$	103.5
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 and Other	—		43.5			1.8			(0.1		)	45.2
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

	Gas Utility		Gas Marketing			Other			Eliminations			Consolidated
Six Months Ended March 31, 2016
Operating Revenues:
Revenues from external customers	$	1,010.3	$	(2.4	)	$	0.8		$	—		$	1,008.7
Intersegment revenues	1.9		23.2			0.9			(26.0		)	—
Total Operating Revenues	1,012.2		20.8			1.7			(26.0		)	1,008.7
Operating Expenses:
Gas Utility
Natural and propane gas	434.9		—			—			(25.3		)	409.6
Other operation and maintenance	186.5		—			—			(0.6		)	185.9
Depreciation and amortization	67.3		—			—			—			67.3
Taxes, other than income taxes	72.1		—			—			—			72.1
Total Gas Utility Operating Expenses	760.8		—			—			(25.9		)	734.9
Gas Marketing and Other	—		14.5			4.7			(0.1		)	19.1
Total Operating Expenses	760.8		14.5			4.7			(26.0		)	754.0
Operating Income (Loss)	$	251.4	$	6.3		$	(3.0	)	$	—		$	254.7
Net Economic Earnings (Loss)	$	152.5	$	2.7		$	(6.6	)	$	—		$	148.6
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 and Other	—		102.1			4.2			(0.2		)	106.1
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

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

	March 31,			September 30,			March 31,
	2016			2015			2015
Total Assets:
Gas Utility	$	4,687.1		$	4,686.2		$	4,615.6
Gas Marketing	156.5			160.6			131.7
Other	1,521.9			1,560.2			1,590.8
Eliminations	(1,045.7		)	(1,116.8		)	(1,157.4		)
Total Assets	$	5,319.8		$	5,290.2		$	5,180.7

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

The following table reconciles the Company's net economic earnings to the most comparable GAAP measure, net income.

	Three Months Ended March 31,						Six Months Ended March 31,
	2016			2015			2016			2015
Net Income (GAAP)	$	100.8		$	94.4		$	147.7		$	141.5
Unrealized loss (gain) on energy-related derivative contracts	1.8			2.6			(1.2		)	(0.4		)
Lower of cost or market inventory adjustments	0.2			(1.0		)	0.5			0.2
Realized loss (gain) on economic hedges prior to sale of the physical commodity	(0.4		)	0.1			(0.4		)	0.1
Acquisition, divestiture and restructuring activities	1.1			1.5			2.0			1.9
Net Economic Earnings (Non-GAAP)	$	103.5		$	97.6		$	148.6		$	143.3