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Stockholders' equity - Stock Options, Restricted Stock Units, and Performance Stock Units (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Weighted Average Remaining Contractual Term (in Years)    
Stock options outstanding 4 years 1 month 6 days  
Stock options exercisable 2 years 3 months 18 days  
2006 Stock Incentive Plan    
Number of Shares    
Stock options outstanding, beginning of period (in shares) 1,200,000  
Stock options granted (in shares) 700,000  
Stock options exercised (in shares) 0  
Stock options forfeited (in shares) (200,000)  
Stock options outstanding, end of period (in shares) 1,700,000  
Stock options exercisable, end of period (in shares) 800,000  
Weighted-Average Exercise Price    
Stock options outstanding, beginning of period (in dollars per share) $ 60,830,000  
Stock options granted (in dollars per share) 39,110,000  
Stock options exercised (in dollars per share) 27,710,000  
Stock options forfeited (in dollars per share) 64,660,000  
Stock options outstanding, end of period (in dollars per share) 51,740,000  
Exercisable, end of period (in dollars per share) $ 54,140,000  
Aggregate Intrinsic Value    
Stock options outstanding $ 0.0 $ 3.0
Stock options exercisable $ 0.0  
2006 Stock Incentive Plan | Performance Shares And Restricted Stock Units (RSUs)    
Number of Shares    
Restricted/performance stock units outstanding, beginning of period (in shares) 1,100,000  
Restricted/performance stock units granted (in shares) 1,900,000  
Restricted/performance stock units vested (in shares) (500,000)  
Restricted/performance stock units forfeited (in shares) (300,000)  
Restricted/performance stock units outstanding, end of period (in shares) 2,200,000  
Weighted-Average Grant Date Fair Value    
Restricted/performance stock units outstanding, beginning of period (in dollars per share) $ 70,820,000  
Restricted/performance stock units granted (in dollars per share) 34,490,000  
Restricted/performance stock units vested (in dollars per share) 67,480,000  
Restricted/performance stock units forfeited (in dollars per share) 55,460,000  
Restricted/performance stock units outstanding, end of period (in dollars per share) $ 42,300,000  
Aggregate Intrinsic Value    
Restricted/performance stock units outstanding $ 25.8 $ 47.6