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CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Operating revenues	$ 1,643.7	$ 1,657.5	$ 5,602.7	$ 5,593.5
Operating expenses
Cost of sales	524.1	542.7	2,043.9	2,025.6
Other operation and maintenance	553.1	473.1	1,602.7	1,457.4
Depreciation and amortization	212.8	201.2	628.1	593.5
Property and revenue taxes	51.0	48.3	149.4	147.9
Total operating expenses	1,341.0	1,265.3	4,424.1	4,224.4
Operating income	302.7	392.2	1,178.6	1,369.1
Equity in earnings of transmission affiliates	33.7	39.2	95.2	122.9
Other income, net	26.1	17.8	65.0	49.2
Interest expense	112.0	103.8	327.2	310.4
Other expense	(52.2)	(46.8)	(167.0)	(138.3)
Income before income taxes	250.5	345.4	1,011.6	1,230.8
Income tax expense	17.0	129.7	156.4	458.8
Net income	233.5	215.7	855.2	772.0
Preferred stock dividends of subsidiary	0.3	0.3	0.9	0.9
Net income attributed to common shareholders	$ 233.2	$ 215.4	$ 854.3	$ 771.1
Earnings per share
Basic (in dollars per share)	$ 0.74	$ 0.68	$ 2.71	$ 2.44
Diluted (in dollars per share)	$ 0.74	$ 0.68	$ 2.70	$ 2.43
Weighted average common shares outstanding
Basic (in shares)	315.5	315.6	315.5	315.6
Diluted (in shares)	316.9	317.5	316.9	317.5
Dividends per share of common stock (in dollars per share)	$ 0.5525	$ 0.5200	$ 1.6575	$ 1.5600

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