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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Income Tax Disclosure [Abstract] |  |  |  |  |
Income tax expense | $ 56.6 | $ 55.3 | $ 164.8 | $ 145.8 |
Effective income tax rate (as a percent) | 23.80% | 22.90% | 23.40% | 24.20% |
Income tax expense (benefits), tax credit, discrete benefits charges | $ (1.5) | $ (1.0) | $ (5.7) | $ 3.2 |
Income tax expense (benefits) tax credit discrete items release of reserves | (0.7) |  |  |  |
Income tax benefit, tax credit, discrete items purchase of discounted federal tax credits |  |  | (3.2) |  |
Income tax benefits, tax credit, discrete items amended return interest income |  |  | (1.1) |  |
Unrecognized tax benefits | 64.7 |  | 64.7 |  | $ 64.3
Net unrecognized tax benefits, excluding interest and penalties that would affect the company's net income if recognized | 51.0 |  | 51.0 |  |
Interest and penalties expense on unrecognized tax benefits |  |  | 3.0 | 1.8 |
Accruals for payment of interest and penalties | 10.8 |  | 10.8 |  |
Significant change in unrecognized tax benefits is reasonably possible, amount of unrecorded benefit | $ 23.2 |  | 23.2 |  |
Cash paid for income taxes, net of refunds |  |  | 364.9 | 122.6 |
Cash paid for purchase of transferable tax credits |  |  | $ 65.4 | $ 5.3 |

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