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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
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Income Tax Disclosure [Abstract] |  |
Alternative minimum tax and other credit carryforwards | $ 867.3 | $ 772.7
Accrued and unfunded compensation and employee benefits | 364.4 | 321.8
Amortizable intangible assets | 122.9 | 69.3
Compensation expense related to stock options | 18.3 | 11.1
Accrued liabilities | 129.9 | 126.6
Accrued pension liability | 0.0 | 3.1
Investments | 1.2 | 2.6
Net operating loss carryforwards | 172.7 | 129.4
Capital loss carryforwards | 8.5 | 8.1
Other tax attributes | 34.7 |
Depreciable fixed assets | 13.2 |
Lease liabilities | 103.4 | 96.5
Capitalized indirect property costs | 0.2 | 394.1
Revenue recognition | 42.1 | 0.0
Other | 10.1 | 4.3
Total deferred tax assets | 1,888.9 | 1,939.6
Valuation allowance for deferred tax assets | (195.8) | (135.2)
Deferred tax assets | 1,693.1 | 1,804.4
Nondeductible amortizable intangible assets | 531.7 | 433.9
Accrued pension liability | 1.7 | 0.0
Investment-related partnerships | 6.5 | 6.6
Depreciable fixed assets | 0.0 | 46.5
Right-of-use assets | 95.0 | 88.6
Hedging instruments | 38.2 | 10.7
Other prepaid items | 17.4 | 11.8
Total deferred tax liabilities | 690.5 | 598.1
Net deferred tax assets | $ 1,002.6 | $ 1,206.3

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