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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Income Tax Disclosure [Abstract]    
Alternative minimum tax and other credit carryforwards $ 768.9 $ 867.3
Accrued and unfunded compensation and employee benefits 431.5 364.4
Amortizable intangible assets 94.7 122.9
Compensation expense related to stock options 21.9 18.3
Accrued liabilities 125.9 129.9
Investments 1.9 1.2
Net operating loss carryforwards 162.7 172.7
Capital loss carryforwards 8.4 8.5
Other tax attributes 1.9 34.7
Depreciable fixed assets 22.0 13.2
Lease liabilities 106.4 103.4
Capitalized indirect property costs 0.2 0.2
Revenue recognition 4.6 42.1
Other 5.2 10.1
Total deferred tax assets 1,756.2 1,888.9
Valuation allowance for deferred tax assets (176.5) (195.8)
Deferred tax assets 1,579.7 1,693.1
Nondeductible amortizable intangible assets 564.8 531.7
Accrued pension liability 8.6 1.7
Investment-related partnerships 4.2 6.5
Right-of-use assets 97.1 95.0
Hedging instruments 35.7 38.2
Other prepaid items 16.4 17.4
Total deferred tax liabilities 726.8 690.5
Net deferred tax assets $ 852.9 $ 1,002.6