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Leases (Narrative) (Details) | 12 Months Ended
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Dec. 31, 2023 lease_renewal_period_option
Sheboygan Falls Energy Facility [Member] | WPL [Member] |
Leases [Line Items] |
Finance lease, renewal options (in number of renewal periods) | 1

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147478964/842-20-50-3 + Details
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