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INCOME TAXES - CASH PAID (RECEIVED) FOR INCOME TAXES, NET (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Income taxes paid (received) by jurisdiction, net |  |
Federal | $ (94.9) | $ (108.2)
State | 0.1 | (25.0)
Total income taxes received, net | (94.8) | (133.2)
PTCs sold to third parties | $ 118.4 | 113.0
Wisconsin |  |
Income taxes paid (received) by jurisdiction, net |  |
State |  | $ (25.0)

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- Definition Amount, after income tax refund received, of cash paid to state and local tax jurisdictions for tax on income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 230 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482913/230-10-50-2A Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 22 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482685/740-10-50-22 + Details
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