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LONG-TERM DEBT AND FINANCING ARRANGEMENTS (Tables) | 9 Months Ended
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Sep. 30, 2023
Debt Disclosure [Abstract] |
Long-Term Debt and Financing Arrangements |
|  | September 30, 2023 |  | December 31, 2022
(Millions of Dollars) | Interest Rate | Notional Value | Unamortized Discount | Unamortized Gain/(Loss) Terminated Swaps 1 | Purchase Accounting FV Adjustment | Deferred Financing Fees | Carrying Value |  | Carrying Value
Notes payable due 2025 | 2.30% | $ | 500.0 |  | $ | (0.3) |  | $ | — |  | $ | — |  | $ | (1.2) |  | $ | 498.5 |  |  | $ | 497.7 |
Notes payable due 2026 | 3.40% | 500.0 |  | (0.2) |  | — |  | — |  | (1.1) |  | 498.7 |  |  | 498.3 |
Notes payable due 2026 | 6.27% | 350.0 |  | — |  | — |  | — |  | (1.5) |  | 348.5 |  |  | — |
Notes payable due 2026 | 3.42% | 25.0 |  | — |  | — |  | 1.1 |  | — |  | 26.1 |  |  | 26.4 |
Notes payable due 2026 | 1.84% | 26.4 |  | — |  | — |  | 1.0 |  | — |  | 27.4 |  |  | 28.0 |
Notes payable due 2028 | 6.00% | 400.0 |  | (0.4) |  | — |  | — |  | (2.2) |  | 397.4 |  |  | — |
Notes payable due 2028 | 7.05% | 150.0 |  | — |  | 5.2 |  | 5.0 |  | — |  | 160.2 |  |  | 161.8 |
Notes payable due 2028 | 4.25% | 500.0 |  | (0.2) |  | — |  | — |  | (2.2) |  | 497.6 |  |  | 497.2 |
Notes payable due 2028 | 3.52% | 50.0 |  | — |  | — |  | 3.4 |  | (0.1) |  | 53.3 |  |  | 53.7 |
Notes payable due 2030 | 2.30% | 750.0 |  | (1.6) |  | — |  | — |  | (3.4) |  | 745.0 |  |  | 744.5 |
Notes payable due 2032 | 3.00% | 500.0 |  | (0.8) |  | — |  | — |  | (3.0) |  | 496.2 |  |  | 495.9 |
Notes payable due 2040 | 5.20% | 400.0 |  | (0.2) |  | (25.0) |  | — |  | (2.3) |  | 372.5 |  |  | 371.3 |
Notes payable due 2048 | 4.85% | 500.0 |  | (0.5) |  | — |  | — |  | (4.6) |  | 494.9 |  |  | 494.8 |
Notes payable due 2050 | 2.75% | 750.0 |  | (1.8) |  | — |  | — |  | (7.6) |  | 740.6 |  |  | 740.3 |
Notes payable due 2060 (junior subordinated) | 4.00% | 750.0 |  | — |  | — |  | — |  | (8.7) |  | 741.3 |  |  | 741.2 |
Other, payable in varying amounts 2024 through 2027 | 4.10%-4.31% | 2.1 |  | — |  | — |  | — |  | — |  | 2.1 |  |  | 3.0 |
Total Long-term debt, including current maturities |  | $ | 6,153.5 |  | $ | (6.0) |  | $ | (19.8) |  | $ | 10.5 |  | $ | (37.9) |  | $ | 6,100.3 |  |  | $ | 5,354.1 |
Less: Current maturities of long-term debt |  |  |  |  |  |  | (1.1) |  |  | (1.2) |
Long-term debt |  |  |  |  |  |  | $ | 6,099.2 |  |  | $ | 5,352.9 |
1 Unamortized gain/(loss) associated with interest rate swaps are more fully discussed in Note H, Financial Instruments.

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