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Share-based awards - Summary of Stock Option Activity (Details) - Employee Stock Option
 9 Months Ended
Sep. 30, 2021
$ / shares
shares
Dec. 31, 2020
$ / shares
shares
Sep. 30, 2021
$ / shares
shares
Options Outstanding Number of Shares       
Outstanding at beginning of period (in shares) | shares     553,746
Assumed through business combinations (in shares) | shares     2,177,130
Granted (in shares) | shares     100,299
Exercised (in shares) | shares     (913,743)
Canceled/expired (in shares) | shares     (32,784)
Outstanding at end of period (in shares) | shares 1,884,648 553,746 1,884,648
Exercisable at end of period (in shares) | shares 1,095,429   1,095,429
Weighted Average Exercise Price      
Outstanding at beginning of period (USD per share) | $ / shares     $ 108.53
Assumed through business combinations (in USD per share) | $ / shares     108.78
Granted (USD per share) | $ / shares     177.76
Exercised (USD per share) | $ / shares     113.87
Canceled/expired (USD per share) | $ / shares     132.25
Outstanding at end of period (USD per share) | $ / shares $ 109.50 $ 108.53 109.50
Exercisable at end of period (USD per share) | $ / shares $ 90.80   $ 90.80
Weighted Average Remaining Contractual Life      
Outstanding at end of period 5 years 7 months 28 days 4 years 10 months 9 days  
Exercisable at end of period 4 years 8 months 19 days