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Restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2025 | Mar. 31, 2024
Restructuring Reserve [Roll Forward] |  |
Accruals | $ (1.3) | $ (0.5)
January 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 1.4
Cash payments |  | (1.3)
Ending balance |  | 0.1
August 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 5.4
Accruals |  | (0.5)
Cash payments |  | (3.6)
Ending balance |  | 1.3
May 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 5.3 |
Accruals | (0.7) |
Cash payments | (2.8) |
Ending balance | 1.8 |
August 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 2.4 |
Accruals | (0.6) |
Cash payments | (1.2) |
Ending balance | 0.6 |
Employee transition | January 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 0.0
Cash payments |  | 0.0
Ending balance |  | 0.0
Employee transition | August 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 0.0
Accruals |  | 0.0
Cash payments |  | 0.0
Ending balance |  | 0.0
Employee transition | May 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 0.0 |
Accruals | 0.0 |
Cash payments | 0.0 |
Ending balance | 0.0 |
Employee transition | August 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 0.0 |
Accruals | 0.0 |
Cash payments | 0.0 |
Ending balance | 0.0 |
Severance payments |  |
Restructuring Reserve [Roll Forward] |  |
Accruals | (0.2) | (0.5)
Severance payments | January 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 1.4
Cash payments |  | (1.3)
Ending balance |  | 0.1
Severance payments | August 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 5.3
Accruals |  | (0.5)
Cash payments |  | (3.6)
Ending balance |  | 1.2
Severance payments | May 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 4.5 |
Accruals | 0.0 |
Cash payments | (2.7) |
Ending balance | 1.8 |
Severance payments | August 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 1.9 |
Accruals | (0.2) |
Cash payments | (1.1) |
Ending balance | 0.6 |
Employee benefits |  |
Restructuring Reserve [Roll Forward] |  |
Accruals | (1.1) | 0.0
Employee benefits | January 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 0.0
Cash payments |  | 0.0
Ending balance |  | 0.0
Employee benefits | August 2023 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance |  | 0.1
Accruals |  | 0.0
Cash payments |  | 0.0
Ending balance |  | $ 0.1
Employee benefits | May 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 0.8 |
Accruals | (0.7) |
Cash payments | (0.1) |
Ending balance | 0.0 |
Employee benefits | August 2024 Restructuring Plan |  |
Restructuring Reserve [Roll Forward] |  |
Beginning balance | 0.5 |
Accruals | (0.4) |
Cash payments | (0.1) |
Ending balance | $ 0.0 |

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