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Stockholders’ Deficit - Schedule of Stock Option and Restricted Stock Activity (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Number of shares available for issuance under the Plans |  |  |
Beginning balance (in shares) | 110.0 | 97.9 |
Additional shares authorized (in shares) | 16.8 |  | 17.5
Options and restricted stock units and awards canceled / expired (in shares) | 10.9 |  | 11.5
Shares withheld related to net share settlement of restricted stock units and awards (in shares) | 5.7 |  | 5.3
Options and restricted stock units and awards granted (in shares) | (20.6) |  | (22.2)
Ending balance (in shares) | 122.8 | 110.0 | 97.9
Options Outstanding, Number of shares outstanding under the Plans |  |  |
Beginning balance (in shares) | 0.2 | 0.4 |
Options exercised and restricted stock units and awards released (in shares) | (0.1) |  | (0.2)
Ending balance (in shares) | 0.1 | 0.2 | 0.4
Vested at end of period (in shares) | 0.1 |  |
Unvested at end of period (in shares) | 0.0 |  |
Options Outstanding, Weighted- average exercise price per share |  |  |
Beginning balance (in dollars per share) | $ 13.54 | $ 11.30 |
Options exercised and restricted stock units and awards released (in dollars per share) | 11.68 |  | $ 10.27
Ending balance (in dollars per share) | 6.13 | $ 13.54 | $ 11.30
Vested at end of period (in dollars per share) | 6.13 |  |
Unvested at end of period (in dollars per share) | $ 0 |  |
Options Outstanding, Weighted- average remaining contractual term (In years) |  |  |
Weighted-average contractual term | 3 years 10 months 24 days | 3 years 10 months 24 days | 4 years 6 months
Vested at end of period | 3 years 10 months 24 days |  |
Options outstanding, aggregate intrinsic value | $ 0.6 | $ 2.2 | $ 4.5
Vested at end of period, aggregate intrinsic value | 0.6 |  |
Unvested at end of period, aggregate intrinsic value | $ 0.0 |  |
Restricted Stock |  |  |
Restricted Stock Outstanding, Number of shares outstanding under the Plans |  |  |
Beginning balance (in shares) | 30.4 | 34.8 |
Options exercised and restricted stock units and awards released (in shares) | (14.4) |  | (15.1)
Options and restricted stock units and awards canceled / expired (in shares) | (10.9) |  | (11.5)
Options and restricted stock units and awards granted (in shares) | 20.6 |  | 22.2
Ending balance (in shares) | 25.7 | 30.4 | 34.8
Vested at end of period (in shares) | 0.0 |  |
Restricted Stock Outstanding, Weighted- average grant date fair value per share |  |  |
Beginning balance (in dollars per share) | $ 23.16 | $ 23.40 |
Options exercised and restricted stock units and awards released (in dollars per share) | 23.61 |  | $ 22.77
Options and restricted stock units and awards canceled (in dollars per share) | 23.68 |  | 23.46
Options and restricted stock units and awards granted (in dollars per share) | 24.53 |  | 22.65
Ending balance (in dollars per share) | 23.79 | $ 23.16 | $ 23.40
Vested at end of period (in dollars per share) | $ 0 |  |

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