CONDENSED CONSOLIDATED INCOME STATEMENTS - USD ($) shares in Millions, $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Income Statement [Abstract]
Operating revenues	$ 2,680.2	$ 2,888.1
Operating expenses
Cost of sales	927.1	1,309.7
Other operation and maintenance	530.8	534.0
Depreciation and amortization	333.4	305.5
Property and revenue taxes	75.5	69.6
Total operating expenses	1,866.8	2,218.8
Operating income	813.4	669.3
Equity in earnings of transmission affiliates	44.8	43.8
Other income, net	44.1	40.8
Interest expense	192.0	172.2
Other expense	(103.1)	(87.6)
Income before income taxes	710.3	581.7
Income tax expense	87.7	74.1
Net income	622.6	507.6
Preferred stock dividends of subsidiary	0.3	0.3
Net loss attributed to noncontrolling interests	0.0	0.2
Net income attributed to common shareholders	$ 622.3	$ 507.5
Earnings per share
Basic (in dollars per share)	$ 1.97	$ 1.61
Diluted (in dollars per share)	$ 1.97	$ 1.61
Weighted average common shares outstanding
Basic (in shares)	315.6	315.4
Diluted (in shares)	315.9	315.9

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 924
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479941/924-10-S99-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2