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Supplemental equity and other information - Narrative (Details)
$ / shares in Units, shares in Thousands, $ in Millions
12 Months Ended
Dec. 31, 2024
USD ($)
shares
$ / shares
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Stockholders Equity Note      
Share-based compensation cost | $ $ 12.5 $ 16.6 $ 16.8
Unrecognized compensation cost related to non-vested share-based compensation | $ $ 15.1    
Unrecognized compensation recognition period 2 years 1 month 6 days    
Number of stock options (in shares) | shares 5,416    
Weighted average grant date fair value (in dollars per shares) | $ / shares $ 1.51    
Weighted average exercise price (in dollars per share) | $ / shares $ 14.45    
Remaining contractual term (in years) 3 years 7 months 6 days    
2027 Notes | Convertible Debt      
Stockholders Equity Note      
Aggregate shares receivable upon conversion (shares) | shares 22,500    
Securities excluded from computation of earnings per share (in shares) | shares 14,900    
2031 Notes | Convertible Debt      
Stockholders Equity Note      
Aggregate shares receivable upon conversion (shares) | shares 143,900    
Securities excluded from computation of earnings per share (in shares) | shares 99,100    
RSA      
Stockholders Equity Note      
Vesting period (years) 3 years    
Aggregate intrinsic value of unvested | $ $ 21.1    
RSA | Share-Based Payment Arrangement, Tranche One      
Stockholders Equity Note      
Vesting, percentage 33.30%    
RSA | Share-Based Payment Arrangement, Tranche Two      
Stockholders Equity Note      
Vesting, percentage 33.30%    
RSA | Share-Based Payment Arrangement, Tranche Three      
Stockholders Equity Note      
Vesting, percentage 33.40%    
RSUs      
Stockholders Equity Note      
Vesting period (years) 3 years    
Performance Stock Units (PSUs) and Restricted Stock Units (RSUs)      
Stockholders Equity Note      
Aggregate intrinsic value of unvested | $ $ 15.8    
CPU's and LTCA's      
Stockholders Equity Note      
Vesting period (years) 3 years    
Unrecognized compensation expense | $ $ 14.3