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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
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Income Tax Disclosure [Abstract] |  |
Alternative minimum tax and other credit carryforwards | $ 772.7 | $ 1,074.0
Accrued and unfunded compensation and employee benefits | 321.8 | 265.6
Amortizable intangible assets | 69.3 | 92.7
Compensation expense related to stock options | 11.1 | 5.8
Accrued liabilities | 126.6 | 112.1
Accrued pension liability | 3.1 | 1.5
Investments | 2.6 | 3.1
Net operating loss carryforwards | 129.4 | 32.7
Capital loss carryforwards | 8.1 | 8.9
Lease liabilities | 96.5 | 106.4
Capitalized indirect property costs | 394.1 |
Hedging instruments |  | 27.3
Other | 4.3 | 5.0
Total deferred tax assets | 1,939.6 | 1,735.1
Valuation allowance for deferred tax assets | (135.2) | (154.9)
Deferred tax assets | 1,804.4 | 1,580.2
Nondeductible amortizable intangible assets | 433.9 | 394.7
Investment-related partnerships | 6.6 | 4.6
Depreciable fixed assets | 46.5 | 16.2
Right-of-use assets | 88.6 | 96.9
Hedging instruments | 10.7 |
Other prepaid items | 11.8 | 8.8
Total deferred tax liabilities | 598.1 | 521.2
Net deferred tax assets | $ 1,206.3 | $ 1,059.0

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