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Report of Business Segments (Tables)

6 Months Ended

Jun. 30, 2018

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 during the three and six months ended June 30, 2018 and 2017.

Three Months Ended June 30, 2018	Electric Utility			Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	567.0		$	—		$	—		$	—		$	567.0
Cost of sales	208.7			—			—			—			208.7
Other operation and maintenance	123.5			0.3			(0.6		)	—			123.2
Depreciation and amortization	80.9			—			—			—			80.9
Taxes other than income	21.6			0.2			0.7			—			22.5
Operating income (loss)	132.3			(0.5		)	(0.1		)	—			131.7
Equity in earnings of unconsolidated affiliates	—			29.3			—			—			29.3
Other income (expense)	10.0			—			(0.6		)	(0.9		)	8.5
Interest expense	39.2			—			2.6			(0.9		)	40.9
Income tax expense	11.1			6.7			0.1			—			17.9
Net income (loss)	$	92.0		$	22.1		$	(3.4	)	$	—		$	110.7
Investment in unconsolidated affiliates	$	—		$	1,144.6		$	9.0		$	—		$	1,153.6
Total assets	$	9,447.8		$	1,147.9		$	95.6		$	(147.7	)	$	10,543.6

Three Months Ended June 30, 2017	Electric Utility			Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	586.4		$	—		$	—		$	—		$	586.4
Cost of sales	232.1			—			—			—			232.1
Other operation and maintenance	114.7			0.2			(2.4		)	—			112.5
Depreciation and amortization	73.7			—			1.0			—			74.7
Taxes other than income	20.2			0.3			0.8			—			21.3
Operating income (loss)	145.7			(0.5		)	0.6			—			145.8
Equity in earnings of unconsolidated affiliates	—			29.4			—			—			29.4
Other income (expense)	13.8			—			(0.5		)	—			13.3
Interest expense	35.6			—			1.5			—			37.1
Income tax expense (benefit)	37.7			10.6			(1.7		)	—			46.6
Net income	$	86.2		$	18.3		$	0.3		$	—		$	104.8
Investment in unconsolidated affiliates	$	—		$	1,153.9		$	5.2		$	—		$	1,159.1
Total assets	$	9,199.0		$	1,513.9		$	89.2		$	(381.6	)	$	10,420.5

Six Months Ended June 30, 2018	Electric Utility			Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,059.7		$	—		$	—		$	—		$	1,059.7
Cost of sales	419.2			—			—			—			419.2
Other operation and maintenance	243.2			0.6			(1.8		)	—			242.0
Depreciation and amortization	159.7			—			—			—			159.7
Taxes other than income	44.3			0.4			1.9			—			46.6
Operating income (loss)	193.3			(1.0		)	(0.1		)	—			192.2
Equity in earnings of unconsolidated affiliates	—			63.2			—			—			63.2
Other income (expense)	20.6			—			(1.3		)	(1.5		)	17.8
Interest expense	76.5			—			4.5			(1.5		)	79.5
Income tax expense (benefit)	14.1			16.5			(2.6		)	—			28.0
Net income (loss)	$	123.3		$	45.7		$	(3.3	)	$	—		$	165.7
Investment in unconsolidated affiliates	$	—		$	1,144.6		$	9.0		$	—		$	1,153.6
Total assets	$	9,447.8		$	1,147.9		$	95.6		$	(147.7	)	$	10,543.6

Six Months Ended June 30, 2017	Electric Utility			Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,042.4		$	—		$	—		$	—		$	1,042.4
Cost of sales	440.8			—			—			—			440.8
Other operation and maintenance	239.4			0.3			(5.1		)	—			234.6
Depreciation and amortization	128.4			—			1.9			—			130.3
Taxes other than income	42.5			0.5			2.2			—			45.2
Operating income (loss)	191.3			(0.8		)	1.0			—			191.5
Equity in earnings of unconsolidated affiliates	—			65.0			—			—			65.0
Other income (expense)	25.3			0.1			(2.3		)	(0.1		)	23.0
Interest expense	69.2			—			3.0			(0.1		)	72.1
Income tax expense (benefit)	45.0			26.0			(4.4		)	—			66.6
Net income	$	102.4		$	38.3		$	0.1		$	—		$	140.8
Investment in unconsolidated affiliates	$	—		$	1,153.9		$	5.2		$	—		$	1,159.1
Total assets	$	9,199.0		$	1,513.9		$	89.2		$	(381.6	)	$	10,420.5

X

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 280
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