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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Income Tax Disclosure [Abstract] |  |
Alternative minimum tax and other credit carryforwards | $ 1,074.0 | $ 998.0
Accrued and unfunded compensation and employee benefits | 265.6 | 239.9
Amortizable intangible assets | 92.7 | 61.3
Compensation expense related to stock options | 5.8 | 14.4
Accrued liabilities | 112.1 | 65.7
Accrued pension liability | 1.5 | 9.3
Investments | 3.1 | 1.3
Net operating loss carryforwards | 32.7 | 36.1
Capital loss carryforwards | 8.9 | 9.0
Revenue recognition | 3.7 |
Lease liabilities | 106.4 | 96.3
Hedging instruments | 27.3 | 34.6
Other | 5.0 | 2.8
Total deferred tax assets | 1,738.8 | 1,568.7
Valuation allowance for deferred tax assets | (154.9) | (94.9)
Deferred tax assets | 1,583.9 | 1,473.8
Nondeductible amortizable intangible assets | 394.7 | 316.9
Investment-related partnerships | 4.6 | 8.5
Depreciable fixed assets | 16.2 | 32.4
Right-of-use assets | 96.9 | 92.2
Revenue recognition |  | 33.1
Other prepaid items | 8.8 | 12.0
Total deferred tax liabilities | 521.2 | 495.1
Net deferred tax assets | $ 1,062.7 | $ 978.7

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