Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for nonvested award under share-based payment arrangement. Excludes share and unit options.

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Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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Amount of cash paid to settle liability for award under share-based payment arrangement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Common Equity - Performance Units (Details) - Performance units - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted		171,492	152,382	153,465
Intrinsic value of settled performance units		$ 20.2	$ 27.7	$ 34.5
Tax benefit from distribution of performance units		$ 5.1	$ 6.8	$ 8.4
Performance units outstanding		375,834
Liability recorded on balance sheet		$ 22.4
Compensation cost not yet recognized		$ 13.5
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 8 months 12 days
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted	157,035
Intrinsic value of settled performance units	$ 9.7
Tax benefit from distribution of performance units	$ 2.4