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INCOME TAXES - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income taxes |  |  |
Income tax deductions | $ 125.5 | $ 164.0 | $ 70.0
TCJA refund | 91.5 |  |
Unrecognized tax benefits that would impact effective tax rate | 4.1 |  |
State |  |  |
Income taxes |  |  |
State tax credits | 4.2 |  |
Estimated carried-forward portion of tax credits | 2.2 |  |
Federal |  |  |
Income taxes |  |  |
Net operating loss resulting from repairs and maintenance deductions | 130.3 |  |
State |  |  |
Income taxes |  |  |
Net operating loss resulting from repairs and maintenance deductions | $ 175.8 |  |

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- Definition Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 + Details
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