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Stockholders’ Deficit - Schedule of Stock Option and Restricted Stock Activity (Details) $ / shares in Units, shares in Millions, $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares
Number of shares available for issuance under the Plans |  |
Beginning balance (in shares) | 110.0 |
Additional shares authorized (in shares) | 16.8 |
Options and restricted stock units and awards canceled (in shares) | 3.2 |
Shares withheld related to net share settlement of restricted stock units and awards (in shares) | 2.7 |
Options and restricted stock units and awards granted (in shares) | (15.4) |
Ending balance (in shares) | 117.3 | 110.0
Options outstanding, Number of shares outstanding under the Plans |  |
Beginning balance (in shares) | 0.2 |
Ending balance (in shares) | 0.2 | 0.2
Vested at end of period (in shares) | 0.2 |
Unvested at end of period (in shares) | 0.0 |
Options outstanding, Weighted- average exercise price per share |  |
Beginning balance (in dollars per share) | $ / shares | $ 13.54 |
Ending balance (in dollars per share) | $ / shares | 14.67 | $ 13.54
Vested at end of period (in dollars per share) | $ / shares | 14.67 |
Unvested at end of period (in dollars per share) | $ / shares | $ 0 |
Options outstanding, Weighted- average remaining contractual term (In years) |  |
Weighted-average contractual term | 3 years 3 months 18 days | 3 years 10 months 24 days
Vested at end of period | 3 years 3 months 18 days |
Options outstanding, aggregate intrinsic value | $ | $ 0.9 | $ 2.2
Vested at end of period, aggregate intrinsic value | $ | 0.9 |
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 |
Options exercised and restricted stock units and awards released (in shares) | (7.1) |
Options and restricted stock units and awards canceled (in shares) | (3.2) |
Options and restricted stock units and awards granted (in shares) | 15.4 |
Ending balance (in shares) | 35.5 | 30.4
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) | $ / shares | $ 23.16 |
Options exercised and restricted stock units and awards released (in dollars per share) | $ / shares | 23.45 |
Options and restricted stock units and awards canceled (in dollars per share) | $ / shares | 23.90 |
Options and restricted stock units and awards granted (in dollars per share) | $ / shares | 24.53 |
Ending balance (in dollars per share) | $ / shares | 23.63 | $ 23.16
Vested at end of period (in dollars per share) | $ / shares | $ 0 |

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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(03) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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