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INCOME TAXES (Tables) | 3 Months Ended
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Mar. 31, 2021
Income Tax Disclosure [Abstract] |
Schedule of effective income tax rate reconciliation | The provision for income taxes differs from the amount of income tax determined by applying the applicable United States statutory federal income tax rate to income before income taxes as a result of the following:
|  | Three Months Ended March 31, 2021 |  | Three Months Ended March 31, 2020
(in millions) |  | Amount |  | Effective Tax Rate |  | Amount |  | Effective Tax Rate
Statutory federal income tax |  | $ | 122.8 |  |  | 21.0 | % |  | $ | 113.9 |  |  | 21.0 | %
State income taxes net of federal tax benefit |  | 36.9 |  |  | 6.3 | % |  | 34.0 |  |  | 6.3 | %
PTCs |  | (34.0) |  |  | (5.8) | % |  | (18.4) |  |  | (3.4) | %
Federal excess deferred tax amortization – Wisconsin unprotected |  | (30.3) |  |  | (5.2) | % |  | (22.1) |  |  | (4.1) | %
Federal excess deferred tax amortization |  | (14.6) |  |  | (2.5) | % |  | (13.0) |  |  | (2.4) | %
Uncertain tax positions |  | (8.2) |  |  | (1.4) | % |  | — |  |  | — | %
Other |  | 2.3 |  |  | 0.4 | % |  | (4.4) |  |  | (0.8) | %
Total income tax expense |  | $ | 74.9 |  |  | 12.8 | % |  | $ | 90.0 |  |  | 16.6 | %

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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