Report of Business Segments

6 Months Ended

Jun. 30, 2012

Segment Reporting [Abstract]

Report of Business Segments

Report of Business Segments

The Company's business is divided into four segments for financial reporting purposes as follows: (i) electric utility, which is engaged in the generation, transmission, distribution and sale of electric energy, (ii) natural gas transportation and storage, (iii) natural gas gathering and processing and (iv) natural gas marketing.  Other Operations primarily includes the operations of the holding company.  Intersegment revenues are recorded at prices comparable to those of unaffiliated customers and are affected by regulatory considerations.  In reviewing its segment operating results, the Company focuses on operating income as its measure of segment profit and loss, and, therefore, has presented this information below.  The following tables summarize the results of the Company's business segments during the three and sixmonths endedJune 30, 2012 and 2011.

Three Months Ended June 30, 2012	Electric Utility		Transportation and Storage		Gathering and Processing		Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	528.0	$	75.1	$	266.4	$	76.6		$	—		$	(91.1	)	$	855.0
Cost of goods sold	204.6		37.4		178.6		79.5			—			(90.8		)	409.3
Gross margin on revenues	323.4		37.7		87.8		(2.9		)	—			(0.3		)	445.7
Other operation and maintenance	114.7		10.6		29.9		2.2			(4.4		)	—			153.0
Depreciation and amortization	62.7		5.4		18.6		0.3			3.5			—			90.5
Impairment of assets	—		—		0.1		—			—			—			0.1
Taxes other than income	18.2		3.5		2.1		0.1			0.9			—			24.8
Operating income (loss)	$	127.8	$	18.2	$	37.1	$	(5.5	)	$	—		$	(0.3	)	$	177.3
Total assets	$	6,833.2	$	2,051.8	$	1,623.0	$	47.5		$	331.4		$	(1,535.5	)	$	9,351.4

Three Months Ended June 30, 2011	Electric Utility		Transportation and Storage		Gathering and Processing		Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	568.7	$	108.0	$	289.1	$	168.3		$	—		$	(156.0	)	$	978.1
Cost of goods sold	254.3		69.5		210.9		170.4			—			(155.0		)	550.1
Gross margin on revenues	314.4		38.5		78.2		(2.1		)	—			(1.0		)	428.0
Other operation and maintenance	110.2		13.0		26.3		2.0			(4.2		)	(0.7		)	146.6
Depreciation and amortization	52.1		5.8		13.4		0.1			3.3			—			74.7
Taxes other than income	18.8		3.3		1.7		(0.1		)	0.8			—			24.5
Operating income (loss)	$	133.3	$	16.4	$	36.8	$	(4.1	)	$	0.1		$	(0.3	)	$	182.2
Total assets	$	6,290.5	$	1,474.8	$	1,106.7	$	80.2		$	152.4		$	(969.1	)	$	8,135.5

Six Months Ended June 30, 2012	Electric Utility		Transportation and Storage		Gathering and Processing			Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	954.7	$	154.2	$	570.9		$	206.6		$	—		$	(190.7	)	$	1,695.7
Cost of goods sold	400.1		80.9		396.5			206.7			—			(189.6		)	894.6
Gross margin on revenues	554.6		73.3		174.4			(0.1		)	—			(1.1		)	801.1
Other operation and maintenance	225.3		21.4		60.0			4.4			(9.7		)	(0.8		)	300.6
Depreciation and amortization	122.4		10.6		36.4			0.7			7.0			—			177.1
Impairment of assets	—		—		0.3			—			—			—			0.3
Gain on insurance proceeds	—		—		(7.5		)	—			—			—			(7.5		)
Taxes other than income	39.3		8.2		4.6			0.2			2.7			—			55.0
Operating income (loss)	$	167.6	$	33.1	$	80.6		$	(5.4	)	$	—		$	(0.3	)	$	275.6
Total assets	$	6,833.2	$	2,051.8	$	1,623.0		$	47.5		$	331.4		$	(1,535.5	)	$	9,351.4

Six Months Ended June 30, 2011	Electric Utility		Transportation and Storage		Gathering and Processing		Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	990.8	$	208.2	$	555.8	$	366.4		$	—		$	(302.6	)	$	1,818.6
Cost of goods sold	473.7		133.5		407.2		369.7			—			(300.8		)	1,083.3
Gross margin on revenues	517.1		74.7		148.6		(3.3		)	—			(1.8		)	735.3
Other operation and maintenance	216.0		22.1		53.1		4.1			(8.9		)	(1.5		)	284.9
Depreciation and amortization	103.9		11.2		26.9		0.1			6.6			—			148.7
Taxes other than income	37.9		7.6		3.6		0.1			2.4			—			51.6
Operating income (loss)	$	159.3	$	33.8	$	65.0	$	(7.6	)	$	(0.1	)	$	(0.3	)	$	250.1
Total assets	$	6,290.5	$	1,474.8	$	1,106.7	$	80.2		$	152.4		$	(969.1	)	$	8,135.5