Report of Business Segments (Tables)

6 Months Ended

Jun. 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 six months ended June 30, 2019 and 2018.

Three Months Ended June 30, 2019	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	513.7	$	—		$	—		$	—		$	513.7
Cost of sales	178.7		—			—			—			178.7
Other operation and maintenance	120.0		0.3			(0.5		)	—			119.8
Depreciation and amortization	84.3		—			—			—			84.3
Taxes other than income	20.1		0.1			0.7			—			20.9
Operating income (loss)	110.6		(0.4		)	(0.2		)	—			110.0
Equity in earnings of unconsolidated affiliates	—		35.8			—			—			35.8
Other income (expense)	1.5		(0.4		)	1.0			(0.6		)	1.5
Interest expense	33.3		—			3.2			(0.6		)	35.9
Income tax expense (benefit)	4.3		8.1			(1.2		)	—			11.2
Net income (loss)	$	74.5	$	26.9		$	(1.2	)	$	—		$	100.2
Investment in unconsolidated affiliates	$	—	$	1,157.2		$	14.1		$	—		$	1,171.3
Total assets	$	9,733.8	$	1,160.0		$	104.5		$	(112.1	)	$	10,886.2

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	117.5		0.3			(0.6		)	—			117.2
Depreciation and amortization	80.9		—			—			—			80.9
Taxes other than income	21.6		0.2			0.7			—			22.5
Operating income (loss)	138.3		(0.5		)	(0.1		)	—			137.7
Equity in earnings of unconsolidated affiliates	—		29.3			—			—			29.3
Other income (expense)	4.0		—			(0.6		)	(0.9		)	2.5
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

Six Months Ended June 30, 2019	Electric Utility		Natural Gas Midstream Operations			Other Operations			Eliminations			Total
(In millions)
Operating revenues	$	1,003.7	$	—		$	—		$	—		$	1,003.7
Cost of sales	391.3		—			—			—			391.3
Other operation and maintenance	240.3		0.7			(2.2		)	—			238.8
Depreciation and amortization	166.7		—			—			—			166.7
Taxes other than income	44.5		0.3			2.4			—			47.2
Operating income (loss)	160.9		(1.0		)	(0.2		)	—			159.7
Equity in earnings of unconsolidated affiliates	—		66.5			—			—			66.5
Other income (expense)	4.1		(7.8		)	1.7			(1.0		)	(3.0		)
Interest expense	65.7		—			5.8			(1.0		)	70.5
Income tax expense (benefit)	5.2		9.5			(9.3		)	—			5.4
Net income	$	94.1	$	48.2		$	5.0		$	—		$	147.3
Investment in unconsolidated affiliates	$	—	$	1,157.2		$	14.1		$	—		$	1,171.3
Total assets	$	9,733.8	$	1,160.0		$	104.5		$	(112.1	)	$	10,886.2

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	231.1		0.6			(1.8		)	—			229.9
Depreciation and amortization	159.7		—			—			—			159.7
Taxes other than income	44.3		0.4			1.9			—			46.6
Operating income (loss)	205.4		(1.0		)	(0.1		)	—			204.3
Equity in earnings of unconsolidated affiliates	—		63.2			—			—			63.2
Other income (expense)	8.5		—			(1.3		)	(1.5		)	5.7
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