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INCOME TAXES (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Effective Income Tax Rate Reconciliation, Amount |  |  |  |
Statutory federal income tax, amount | $ 78.9 | $ 71.8 | $ 298.1 | $ 263.7
State income taxes net of federal tax benefit, amount | 23.5 | 21.5 | 89.3 | 79.2
PTCs, amount | (18.6) | (17.0) | (86.3) | (64.5)
Federal excess deferred tax amortization, amount | (8.1) | (7.8) | (32.3) | (30.3)
Federal excess deferred tax amortization - Wisconsin unprotected, amount | (0.1) | (16.3) | (0.6) | (62.9)
Other, amount | (2.2) | (1.4) | (4.3) | (5.4)
Total income tax expense, amount | $ 73.4 | $ 50.8 | $ 263.9 | $ 179.8
Effective Income Tax Rate Reconciliation, Percent |  |  |  |
Statutory federal income tax, percentage | 21.00% | 21.00% | 21.00% | 21.00%
State income taxes net of federal tax benefit, percentage | 6.30% | 6.30% | 6.30% | 6.30%
PTCs, percentage | (5.00%) | (5.00%) | (6.10%) | (5.10%)
Federal excess deferred tax amortization, percentage | (2.20%) | (2.30%) | (2.30%) | (2.40%)
Federal excess deferred tax amortization - Wisconsin unprotected, percentage | 0.00% | (4.80%) | 0.00% | (5.00%)
Other, percentage | (0.50%) | (0.20%) | (0.30%) | (0.50%)
Total income tax expense, percent | 19.60% | 15.00% | 18.60% | 14.30%

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