Common stock, stock option plans and stock compensation agreements - Summary of Restricted Share Units (Details)	12 Months Ended
	Dec. 31, 2023 shares
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	13,616,000
Granted (in shares)	5,910,000
Issued (in shares)	(4,329,000)
Canceled/forfeited/adjusted (in shares)	(2,259,000)
Ending balance (in shares)	12,938,000
Cancelled in period (in shares)	1,421
Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Beginning balance (in shares)	2,357,000
Granted (in shares)	828,000
Issued (in shares)	(785,000)
Canceled/forfeited/adjusted (in shares)	(363,000)
Ending balance (in shares)	2,037,000
Cancelled in period (in shares)	264