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DEBT - Debt (Details) - USD ($) $ in Millions | Jun. 30, 2024 | Dec. 31, 2023 | Jun. 30, 2023 | Mar. 31, 2023
--- | --- | --- | --- | ---
Debt Instrument [Line Items] |  |  |  |
Total short-term debt | $ 95.0 | $ 0.0 | $ 0.0 |
Total long-term debt - face value | 3,391.1 | 3,941.5 | 3,941.6 |
Unamortized discounts and debt issuance costs | (58.9) | (63.4) | (65.9) |
Fair value adjustments | 0.0 | (0.3) | (2.0) |
Total long-term debt - book value | 3,332.2 | 3,877.8 | 3,873.7 |
Less current maturities | (0.5) | (0.5) | (0.5) |
Total long-term debt - reported value | 3,331.7 | 3,877.3 | 3,873.2 |
Estimated fair value of long-term debt | 3,158.6 | 3,798.0 | 3,715.0 |
Commercial Paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total short-term debt | 95.0 | 0.0 | 0.0 |
Notes | 4.50% notes due 2025 3 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 400.0 | 400.0 | 400.0 |
Interest rate | 4.50% |  |  |
Effective interest rate | 4.65% |  |  |
Notes | 5.80% notes due 2026 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 0.0 | 550.0 | 550.0 | $ 550.0
Interest rate | 5.80% |  |  | 5.80%
Notes | 3.90% notes due 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 400.0 | 400.0 | 400.0 |
Interest rate | 3.90% |  |  |
Effective interest rate | 4.00% |  |  |
Notes | 3.50% notes due 2030 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 750.0 | 750.0 | 750.0 |
Interest rate | 3.50% |  |  |
Effective interest rate | 3.94% |  |  |
Notes | 7.15% notes due 2037 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 129.2 | 129.2 | 129.2 |
Interest rate | 7.15% |  |  |
Effective interest rate | 8.05% |  |  |
Notes | 4.50% notes due 2047 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 700.0 | 700.0 | 700.0 |
Interest rate | 4.50% |  |  |
Effective interest rate | 4.59% |  |  |
Notes | 4.70% notes due 2048 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 460.9 | 460.9 | 460.9 |
Interest rate | 4.70% |  |  |
Effective interest rate | 5.42% |  |  |
Other notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 1.0 | 1.4 | 1.5 |
Effective interest rate | 0.42% |  |  |
Line Of Credit | Bank line of credit expires 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total short-term debt | $ 0.0 | 0.0 | 0.0 |
Line Of Credit | Bank line of credit expires 2027 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Total long-term debt - face value | $ 0.0 | $ 0.0 | $ 0.0 |

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