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Income Taxes (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income Tax Examination [Line Items] |  |  |  |  |
Effective tax benefit rate | 23.10% | 21.60% | 23.50% | 19.20% |
U.S. federal statutory rate | 21.00% | 21.00% | 21.00% | 21.00% |
Effective Income Tax Rate Reconciliation, Tax Expense (Benefit), Share-based Payment Arrangement, Amount |  | $ 4.6 | $ 22.4 | $ 31.9 |
Unrecognized tax benefits | $ 39.2 |  | 39.2 |  | $ 32.8
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | $ 17.3 |  | $ 17.3 |  | $ 13.6
Other Tax Expense (Benefit) |  | 17.0 |  | 37.1 |
State and Local Jurisdiction [Member] |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |
Other Tax Expense (Benefit) |  | $ 11.7 |  | $ 11.2 |

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