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Stock-based compensation (Tables) | 3 Months Ended
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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 options | Equity |  | $ | 3.6 |  |  | $ | 4.0 |  |  |  |  |
RSUs | Equity |  | 8.7 |  |  | 7.6 |  |  |  |  |
Other | Both |  | 0.4 |  |  | (0.9) |  |  |  |  |
Total | $ | 12.7 |  |  | $ | 10.7 |  |  |  |  |
Award classification: |  |  |  |  |  |  |
Equity | $ | 12.6 |  |  | $ | 12.0 |  |  |  |  |
Liability | 0.1 |  |  | (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 options |  | Weighted average exercise price per option |  | Aggregate intrinsic value |  | Weighted average remaining term
Balance at December 31, 2022 | 16.1 |  |  | $ | 20.90 |  |  |  |  |
Granted | 1.5 |  |  | 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 vest | 4.5 |  |  | 24.15 |  |  | 6.6 |  |  | 8.4 years
Vested | 12.9 |  |  | 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 awards |  | Weighted average grant date fair value per award
Balance at December 31, 2022 | 4.2 |  |  | $ | 24.29 |
Granted | 1.6 |  |  | 26.88 |
Vested | (0.9) |  |  | 21.22 |
Forfeited | — |  |  | 27.81 |
Balance at March 31, 2023 | 4.9 |  |  | 25.76 |

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