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EMPLOYEE BENEFITS - Schedule of Asset Category (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Pension and SERP |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 5,806.4 | $ 6,495.5 | $ 5,409.2
Uncategorized | 5,116.9 | 5,479.8 |
Pension and SERP | Total Assets Before 401 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 6,062.0 | 6,794.0 |
Pension and SERP | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,509.9 | 2,107.7 |
Uncategorized | 1,102.2 | 1,385.2 |
Pension and SERP | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,954.4 | 2,062.5 |
Uncategorized | 1,598.8 | 1,689.1 |
Pension and SERP | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 1,684.9 | 1,702.7 |
Uncategorized | 1,684.9 | 1,702.7 |
Pension and SERP | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 912.8 | 921.1 |
Uncategorized | 731.0 | 702.8 |
Pension and SERP | 401 PBOP Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | (255.6) | (298.5) |
Pension and SERP | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 866.6 | 1,080.4 |
Pension and SERP | Level 1 | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 407.7 | 722.5 |
Pension and SERP | Level 1 | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 277.1 | 139.6 |
Pending redemption settlements | 138.0 |  |
Pension and SERP | Level 1 | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension and SERP | Level 1 | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 181.8 | 218.3 |
Pension and SERP | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 78.5 | 233.8 |
Pension and SERP | Level 2 | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension and SERP | Level 2 | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 78.5 | 233.8 |
Pension and SERP | Level 2 | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
Pension and SERP | Level 2 | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
PBOP |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 970.1 | 1,138.3 | $ 1,004.1
Uncategorized | 431.7 | 463.5 |
PBOP | Total Assets Before 401 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 714.5 | 839.8 |
PBOP | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 336.7 | 439.7 |
Uncategorized | 183.5 | 248.3 |
PBOP | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 199.5 | 220.4 |
Uncategorized | 141.1 | 125.5 |
PBOP | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 70.9 | 58.7 |
Uncategorized | 70.9 | 58.7 |
PBOP | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 107.4 | 121.0 |
Uncategorized | 36.2 | 31.0 |
PBOP | 401 PBOP Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 255.6 | 298.5 |
PBOP | Level 1 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 242.6 | 331.1 |
PBOP | Level 1 | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 153.2 | 191.4 |
PBOP | Level 1 | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 18.2 | 49.7 |
PBOP | Level 1 | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
PBOP | Level 1 | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 71.2 | 90.0 |
PBOP | Level 2 |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 40.2 | 45.2 |
PBOP | Level 2 | Equity securities |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
PBOP | Level 2 | Fixed Income |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 40.2 | 45.2 |
PBOP | Level 2 | Private Equity |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | 0.0 | 0.0 |
PBOP | Level 2 | Real Assets |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |
Fair value of pension plan assets | $ 0.0 | $ 0.0 |

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