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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022
Income Taxes [Line Items] |  |  |  |  |
Effective income tax rate (in percent) | 21.60% | 22.10% | 22.50% | 21.10% |
Benefits that resulted from equity incentive awards | $ 25.3 | $ 1.6 | $ 47.8 | $ 34.0 |
Total amount of unrecognized tax benefits relating to uncertain tax positions | 57.0 |  | 57.0 |  |
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions |  |  | 11.9 |  |
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 11.3 |  | 11.3 |  |
Positions expected to be taken in current period |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions |  |  | 7.4 |  |
Positions taken by an acquired company |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions |  |  | $ 5.5 |  |
Starry Group Holdings, Inc. |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Loss from mark-to-market adjustment on investment |  |  |  |  | $ 91.5
Realized loss on investment |  | 91.5 |  |  |
Valuation allowance release on Starry |  | $ 22.7 |  | $ 22.7 |

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