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INCOME TAXES - Components of Net Deferred Income Tax Liability (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
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