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Supplemental equity and other information - Narrative (Details)
$ / shares in Units, equityInstrument in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
equityInstrument
$ / shares
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
$ / shares
shares
Feb. 01, 2022
USD ($)
Stockholders Equity Note            
Share-based compensation cost | $ $ 2.9 $ 3.9 $ 9.2 $ 12.7    
Unrecognized compensation cost related to non-vested share-based compensation | $ $ 18.8   $ 18.8      
Weighted average period (in years)     2 years 1 month 6 days      
Preferred stock authorized (in shares) 300,000   300,000   300,000  
Preferred stock, par value (in dollars per share) | $ / shares $ 0.01   $ 0.01   $ 0.01  
Preferred stock, issued (in shares) 0   0   0  
Stock Repurchase Program            
Stockholders Equity Note            
Shares authorized for repurchase, value | $           $ 100.0
Repurchase of common stock (in shares)     0      
Remaining authorized shares for share repurchase program | $ $ 96.9   $ 96.9      
Preferred Stock            
Stockholders Equity Note            
Issuance of preferred stock (in shares)     0      
Restricted Stock Awards            
Stockholders Equity Note            
Granted (in shares) 4,000   300,000      
Restricted Stock Units (RSUs)            
Stockholders Equity Note            
Granted (in shares) 2,700,000   2,700,000      
Cash Performance Units And Long-Term Cash Awards            
Stockholders Equity Note            
Unrecognized compensation expense | $ $ 16.8   $ 16.8      
2027 Notes | Convertible Debt            
Stockholders Equity Note            
Aggregate shares receivable upon conversion (in shares) | equityInstrument     287.2      
Securities excluded from computation of earnings per share (in shares)     190,100,000