Report of Business Segments

6 Months Ended

Jun. 30, 2015

Segment Reporting [Abstract]

Report of Business Segments

Report of Business Segments

The Company reports its operations in two business segments: (i) the electric utility segment, which is engaged in the generation, transmission, distribution and sale of electric energy, and (ii) the natural gas midstream operations segment. 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.

The following tables summarize the results of the Company's business segments during the three and six months endedJune 30, 2015 and 2014.

Three Months Ended June 30, 2015	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	549.9	$	—		$	—		$	—		$	549.9
Cost of sales	210.9		—			—			—			210.9
Other operation and maintenance	115.6		0.2			(2.6		)	—			113.2
Depreciation and amortization	74.3		—			1.9			—			76.2
Taxes other than income	21.6		—			0.8			—			22.4
Operating income (loss)	127.5		(0.2		)	(0.1		)	—			127.2
Equity in earnings of unconsolidated affiliates	—		28.2			—			—			28.2
Other income (expense)	4.4		—			0.8			(0.1		)	5.1
Interest expense	37.3		—			0.8			(0.1		)	38.0
Income tax expense	25.6		10.0			(0.6		)	—			35.0
Net income (loss)	$	69.0	$	18.0		$	0.5		$	—		$	87.5
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.2		$	—		$	—		$	1,309.2
Total assets	$	8,332.6	$	1,486.6		$	122.4		$	(348.0	)	$	9,593.6

Three Months Ended June 30, 2014	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	611.8	$	—		$	—		$	—		$	611.8
Cost of sales	270.9		—			—			—			270.9
Other operation and maintenance	115.0		0.4			(4.0		)	—			111.4
Depreciation and amortization	65.0		—			3.3			—			68.3
Taxes other than income	18.7		—			0.7			—			19.4
Operating income (loss)	142.2		(0.4		)	—			—			141.8
Equity in earnings of unconsolidated affiliates	—		39.3			—			—			39.3
Other income (expense)	1.2		—			0.6			—			1.8
Interest expense	37.5		—			1.9			—			39.4
Income tax expense	29.0		14.9			(1.2		)	—			42.7
Net income (loss)	$	76.9	$	24.0		$	(0.1	)	$	—		$	100.8
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.6		$	—		$	—		$	1,309.6
Total assets	$	7,908.0	$	1,371.8		$	141.0		$	(96.5	)	$	9,324.3

Six Months Ended June 30, 2015	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,030.0	$	—		$	—		$	—		$	1,030.0
Cost of sales	422.5		—			—			—			422.5
Other operation and maintenance	229.9		1.0			(6.0		)	—			224.9
Depreciation and amortization	148.1		—			4.0			—			152.1
Taxes other than income	44.7		—			2.2			—			46.9
Operating income (loss)	184.8		(1.0		)	(0.2		)	—			183.6
Equity in earnings of unconsolidated affiliates	—		59.9			—			—			59.9
Other income (expense)	7.3		—			3.3			(0.1		)	10.5
Interest expense	74.1		—			1.4			(0.1		)	75.4
Income tax expense	31.9		18.1			(2.1		)	—			47.9
Net income (loss)	$	86.1	$	40.8		$	3.8		$	—		$	130.7
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.2		$	—		$	—		$	1,309.2
Total assets	$	8,332.6	$	1,486.6		$	122.4		$	(348.0	)	$	9,593.6

Six Months Ended June 30, 2014	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,172.2	$	—		$	—		$	—		$	1,172.2
Cost of sales	564.3		—			—			—			564.3
Other operation and maintenance	232.1		0.4			(8.7		)	—			223.8
Depreciation and amortization	129.3		—			6.2			—			135.5
Taxes other than income	42.5		—			2.5			—			45.0
Operating income (loss)	204.0		(0.4		)	—			—			203.6
Equity in earnings of unconsolidated affiliates	—		87.2			—			—			87.2
Other income (expense)	1.6		—			(0.6		)	—			1.0
Interest expense	71.4		—			3.9			—			75.3
Income tax expense	36.6		33.4			(3.6		)	—			66.4
Net income (loss)	$	97.6	$	53.4		$	(0.9	)	$	—		$	150.1
Investment in unconsolidated affiliates (at historical cost)	$	—	$	1,309.6		$	—		$	—		$	1,309.6
Total assets	$	7,908.0	$	1,371.8		$	141.0		$	(96.5	)	$	9,324.3