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Income Taxes - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Alternative minimum tax and other credit carryforwards | $ 962.1 | $ 856.9
Accrued and unfunded compensation and employee benefits | 156.0 | 158.8
Amortizable intangible assets | 54.3 | 48.8
Compensation expense related to stock options | 11.3 | 12.2
Accrued liabilities | 63.9 | 63.8
Accrued pension liability | 9.9 | 11.5
Investments | 0.9 | 1.5
Net operating loss carryforwards | 37.2 | 36.8
Capital loss carryforwards | 12.6 | 12.2
Lease liabilities | 65.3 | 4.2
Hedging instruments | 11.7 | 1.9
Other | 4.3 | 3.4
Total deferred tax assets | 1,389.5 | 1,212.0
Valuation allowance for deferred tax assets | (80.5) | (67.4)
Deferred tax assets | 1,309.0 | 1,144.6
Nondeductible amortizable intangible assets | 322.4 | 297.6
Investment-related partnerships | 9.1 | 13.6
Depreciable fixed assets | 22.4 | 25.4
Right-of-use assets | 62.6 |
Revenue recognition | 63.7 | 98.1
Other prepaid items | 10.6 | 10.6
Total deferred tax liabilities | 490.8 | 445.3
Net deferred tax assets | $ 818.2 | $ 699.3

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