Report of Business Segments (Tables)

9 Months Ended

Sep. 30, 2019

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 nine months ended September 30, 2019 and 2018.

Three Months Ended September 30, 2019	Electric Utility			Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	755.4		$	—		$	—		$	—		$	755.4
Cost of sales	234.0			—			—			—			234.0
Other operation and maintenance	130.0			0.6			(0.8		)	—			129.8
Depreciation and amortization	94.1			—			—			—			94.1
Taxes other than income	22.3			0.1			0.8			—			23.2
Operating income (loss)	275.0			(0.7		)	—			—			274.3
Equity in earnings of unconsolidated affiliates	—			38.3			—			—			38.3
Other income (expense)	(0.1		)	(0.6		)	0.6			(1.2		)	(1.3		)
Interest expense	38.0			—			2.8			(1.2		)	39.6
Income tax expense	9.7			8.5			2.6			—			20.8
Net income (loss)	$	227.2		$	28.5		$	(4.8	)	$	—		$	250.9
Investment in unconsolidated affiliates	$	—		$	1,159.1		$	16.8		$	—		$	1,175.9
Total assets	$	10,019.7		$	1,161.5		$	108.3		$	(205.8	)	$	11,083.7

Three Months Ended September 30, 2018	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	698.8	$	—		$	—		$	—		$	698.8
Cost of sales	244.4		—			—			—			244.4
Other operation and maintenance	121.1		0.5			1.7			—			123.3
Depreciation and amortization	81.1		—			—			—			81.1
Taxes other than income	21.9		0.1			0.7			—			22.7
Operating income (loss)	230.3		(0.6		)	(2.4		)	—			227.3
Equity in earnings of unconsolidated affiliates	—		40.1			—			—			40.1
Other income (expense)	10.2		(1.2		)	(0.3		)	(2.0		)	6.7
Interest expense	37.8		—			2.9			(2.0		)	38.7
Income tax expense	18.8		9.9			1.6			—			30.3
Net income (loss)	$	183.9	$	28.4		$	(7.2	)	$	—		$	205.1
Investment in unconsolidated affiliates	$	—	$	1,150.3		$	10.3		$	—		$	1,160.6
Total assets	$	9,652.0	$	1,153.9		$	184.0		$	(286.9	)	$	10,703.0

Nine Months Ended September 30, 2019	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,759.1	$	—		$	—		$	—		$	1,759.1
Cost of sales	625.3		—			—			—			625.3
Other operation and maintenance	370.3		1.3			(3.0		)	—			368.6
Depreciation and amortization	260.8		—			—			—			260.8
Taxes other than income	66.8		0.4			3.2			—			70.4
Operating income (loss)	435.9		(1.7		)	(0.2		)	—			434.0
Equity in earnings of unconsolidated affiliates	—		104.8			—			—			104.8
Other income (expense)	4.0		(8.4		)	2.3			(2.2		)	(4.3		)
Interest expense	103.7		—			8.6			(2.2		)	110.1
Income tax expense (benefit)	14.9		18.0			(6.7		)	—			26.2
Net income	$	321.3	$	76.7		$	0.2		$	—		$	398.2
Investment in unconsolidated affiliates	$	—	$	1,159.1		$	16.8		$	—		$	1,175.9
Total assets	$	10,019.7	$	1,161.5		$	108.3		$	(205.8	)	$	11,083.7

Nine Months Ended September 30, 2018	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,758.5	$	—		$	—		$	—		$	1,758.5
Cost of sales	663.6		—			—			—			663.6
Other operation and maintenance	352.2		1.1			(0.1		)	—			353.2
Depreciation and amortization	240.8		—			—			—			240.8
Taxes other than income	66.2		0.5			2.6			—			69.3
Operating income (loss)	435.7		(1.6		)	(2.5		)	—			431.6
Equity in earnings of unconsolidated affiliates	—		103.3			—			—			103.3
Other income (expense)	18.7		(1.2		)	(1.6		)	(3.5		)	12.4
Interest expense	114.3		—			7.4			(3.5		)	118.2
Income tax expense (benefit)	32.9		26.4			(1.0		)	—			58.3
Net income (loss)	$	307.2	$	74.1		$	(10.5	)	$	—		$	370.8
Investment in unconsolidated affiliates	$	—	$	1,150.3		$	10.3		$	—		$	1,160.6
Total assets	$	9,652.0	$	1,153.9		$	184.0		$	(286.9	)	$	10,703.0