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Stock-based compensation (Tables)
3 Months Ended
Mar. 31, 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 March 31,
2023
2022
Stock optionsEquity$3.6 $4.0 
RSUsEquity8.7 7.6 
OtherBoth0.4 (0.9)
Total$12.7 $10.7 
Award classification:
Equity$12.6 $12.0 
Liability0.1 (1.3)
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 
Granted1.5 24.62 
Exercised(0.1)13.19 
Forfeited(0.1)22.39 
Balance at March 31, 2023
17.4 21.26 $40.5 6.2 years
Expected to vest4.5 24.15 6.6 8.4 years
Vested12.9 20.25 33.9 5.4 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 
Granted1.6 26.88 
Vested(0.9)21.22 
Forfeited— 27.81 
Balance at March 31, 2023
4.9 25.76