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Stockholders’ Deficit - Schedule of Stock Option and Restricted Stock Activity (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Dec. 31, 2023
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) 1.5  
Shares withheld related to net share settlement of restricted stock units and awards (in shares) 1.3  
Options and restricted stock units and awards granted (in shares) (1.8)  
Ending balance (in shares) 127.8 110.0
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) $ 13.54  
Ending balance (in dollars per share) 13.54 $ 13.54
Vested at end of period (in dollars per share) 13.54  
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 7 months 6 days 3 years 10 months 24 days
Vested at end of period 3 years 7 months 6 days  
Options outstanding, aggregate intrinsic value $ 1.3 $ 2.2
Vested at end of period, aggregate intrinsic value 1.3  
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) (3.4)  
Options and restricted stock units and awards canceled (in shares) (1.5)  
Options and restricted stock units and awards granted (in shares) 1.8  
Ending balance (in shares) 27.3 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) $ 23.16  
Options exercised and restricted stock units and awards released (in dollars per share) 23.14  
Options and restricted stock units and awards canceled (in dollars per share) 23.17  
Options and restricted stock units and awards granted (in dollars per share) 28.07  
Ending balance (in dollars per share) 23.48 $ 23.16
Vested at end of period (in dollars per share) $ 0