Report of Business Segments (Tables)

12 Months Ended

Dec. 31, 2011

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment [Table Text Block]

The following tables summarize the results of the Company's business segments for the years ended December 31, 2011, 2010 and 2009.

2011	Electric Utility		Transportation and Storage		Gathering and Processing			Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	2,211.5	$	410.5	$	1,167.1		$	678.0		$	—		$	(551.2	)	$	3,915.9
Cost of goods sold	1,013.5		253.3		870.7			688.1			—			(547.7		)	2,277.9
Gross margin on revenues	1,198.0		157.2		296.4			(10.1		)	—			(3.5		)	1,638.0
Other operation and maintenance	436.0		46.5		111.8			7.3			(17.3		)	(3.1		)	581.2
Depreciation and amortization	216.1		21.6		55.6			0.4			13.4			—			307.1
Impairment of assets	—		—		6.3			—			—			—			6.3
Gain on insurance proceeds	—		—		(3.0		)	—			—			—			(3.0		)
Taxes other than income	73.6		14.7		7.0			0.3			4.1			—			99.7
Operating income (loss)	$	472.3	$	74.4	$	118.7		$	(18.1	)	$	(0.2	)	$	(0.4	)	$	646.7
Total assets	$	6,620.9	$	1,805.5	$	1,483.8		$	74.5		$	166.6		$	(1,245.3	)	$	8,906.0
Capital expenditures (A)	$	844.5	$	39.3	$	572.0		$	1.8		$	13.8		$	(0.6	)	$	1,470.8

(A) Includes $200.4 million related to the acquisition of certain gas gathering assets as discussed in Note 3.

2010	Electric Utility		Transportation and Storage		Gathering and Processing		Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	2,109.9	$	403.6	$	1,005.6	$	798.5		$	—		$	(600.7	)	$	3,716.9
Cost of goods sold	1,000.2		246.4		733.3		804.7			—			(597.2		)	2,187.4
Gross margin on revenues	1,109.7		157.2		272.3		(6.2		)	—			(3.5		)	1,529.5
Other operation and maintenance	418.1		48.9		91.5		8.4			(13.6		)	(3.5		)	549.8
Depreciation and amortization	208.7		21.1		50.1		0.1			11.3			—			291.3
Impairment of assets	—		0.7		0.4		—			—			—			1.1
Taxes other than income	69.2		13.9		6.4		0.3			3.6			—			93.4
Operating income (loss)	$	413.7	$	72.6	$	123.9	$	(15.0	)	$	(1.3	)	$	—		$	593.9
Total assets	$	5,898.1	$	1,246.1	$	973.8	$	94.5		$	135.4		$	(678.8	)	$	7,669.1
Capital expenditures	$	631.6	$	70.2	$	164.0	$	2.4		$	14.1		$	(2.4	)	$	879.9

2009	Electric Utility		Transportation and Storage		Gathering and Processing		Marketing			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,751.2	$	401.0	$	657.5	$	619.9		$	—		$	(559.9	)	$	2,869.7
Cost of goods sold	796.3		239.9		458.8		617.7			—			(555.0		)	1,557.7
Gross margin on revenues	954.9		161.1		198.7		2.2			—			(4.9		)	1,312.0
Other operation and maintenance	348.0		40.9		87.2		9.2			(13.9		)	(4.6		)	466.8
Depreciation and amortization	187.4		20.4		43.9		0.1			10.8			—			262.6
Impairment of assets	0.3		0.9		1.9		—			—			—			3.1
Taxes other than income	65.1		13.2		5.5		0.4			3.4			—			87.6
Operating income (loss)	$	354.1	$	85.7	$	60.2	$	(7.5	)	$	(0.3	)	$	(0.3	)	$	491.9
Total assets	$	5,478.1	$	1,159.5	$	866.1	$	125.2		$	137.3		$	(499.5	)	$	7,266.7
Capital expenditures	$	600.5	$	71.4	$	166.0	$	—		$	10.2		$	(0.3	)	$	847.8