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INCOME TAXES - Components of Net Deferred Income Tax Liability (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Income Tax Disclosure [Abstract] |  |
Operating lease liabilities | $ 140.8 | $ 139.1
Asset retirement obligations & other reserves | 86.6 | 87.1
State net operating losses | 74.7 | 79.6
Incentive compensation | 52.4 | 57.6
State bonus depreciation | 55.7 | 54.7
Capitalized research expenditures | 39.7 | 25.4
Employee benefits | 22.2 | 22.9
Other | 81.8 | 56.9
Total gross deferred tax assets | 553.9 | 523.3
Valuation allowance | (87.7) | (89.5)
Total net deferred tax asset | 466.2 | 433.8
Property, plant & equipment | 1,244.8 | 907.1
Goodwill/other intangible assets | 323.2 | 334.4
Operating lease right-of-use assets | 129.8 | 128.2
Other | 104.9 | 93.0
Total deferred tax liabilities | 1,802.7 | 1,462.7
Deferred income taxes, net | $ 1,336.5 | $ 1,028.9

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