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Stock-based compensation (Tables)
9 Months Ended
Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]  
Schedule of components of stock-based compensation expense The following table presents the components of stock-based compensation expense:
(in millions)
Classification
Three months ended September 30,
Nine months ended September 30,
2023
2022
2023
2022
Stock optionsEquity$3.0 $4.1 $10.2 $12.1 
RSUsEquity6.5 9.3 20.7 26.0 
OtherBoth0.3 (1.3)0.8 (2.3)
Total$9.8 $12.1 $31.7 $35.8 
Award classification:
Equity$9.7 $13.7 $31.6 $39.1 
Liability0.1 (1.6)0.1 (3.3)
Schedule of information about outstanding stock options The following table presents information about outstanding stock options:
(options and intrinsic value in millions)
Number of optionsWeighted average exercise price per optionAggregate intrinsic valueWeighted average remaining term
Balance at December 31, 2022
16.1 $20.90 
Granted2.1 23.53 
Exercised(0.7)15.41 
Forfeited(0.7)24.83 
Balance at September 30, 2023
16.8 21.29 $36.5 5.8 years
Expected to vest3.9 24.83 2.3 8.5 years
Vested12.9 20.22 34.2 4.9 years
Schedule of information about unvested RSUs The following table presents information about unvested RSUs:
(awards in millions)
Number of awardsWeighted average grant date fair value per award
Balance at December 31, 2022
4.2 $24.29 
Granted2.1 26.21 
Vested(1.7)18.80 
Forfeited(0.5)29.12 
Balance at September 30, 2023
4.1 26.69