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Impairment and restructuring charges - Schedule of Restructuring Reserve by Type of Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Mar. 31, 2024 | Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Accruals | $ 17.1 |  | $ (0.1) |  | $ 16.6 | $ 9.6
January 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.1 | $ 1.4 | 7.4 | $ 0.0 | 1.4 | 0.0
Accruals |  |  | (0.1) | 9.7 |  |
Cash payments | (0.1) | (1.3) | (3.7) | (2.3) |  |
Ending balance | 0.0 | 0.1 | 3.6 | 7.4 | 0.0 | 3.6
August 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 1.3 | 5.4 |  |  | 5.4 |
Accruals | (0.1) | (0.5) |  |  |  |
Cash payments | (0.6) | (3.6) |  |  |  |
Ending balance | 0.6 | 1.3 |  |  | 0.6 |
May 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 |  |  |  |  |
Accruals | 17.2 |  |  |  |  |
Cash payments | (0.2) |  |  |  |  |
Ending balance | 17.0 | 0.0 |  |  | 17.0 |
Employee transition |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Accruals | 0.2 |  | 0.0 |  | 0.2 | 0.3
Employee transition | January 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 | 0.0 | 0.1 | 0.0 | 0.0 | 0.0
Accruals |  |  | 0.0 | 0.3 |  |
Cash payments | 0.0 | 0.0 | 0.0 | (0.2) |  |
Ending balance | 0.0 | 0.0 | 0.1 | 0.1 | 0.0 | 0.1
Employee transition | August 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 | 0.0 |  |  | 0.0 |
Accruals | 0.0 | 0.0 |  |  |  |
Cash payments | 0.0 | 0.0 |  |  |  |
Ending balance | 0.0 | 0.0 |  |  | 0.0 |
Employee transition | May 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 |  |  |  |  |
Accruals | 0.2 |  |  |  |  |
Cash payments | (0.2) |  |  |  |  |
Ending balance | 0.0 | 0.0 |  |  | 0.0 |
Severance payments |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Accruals | 14.8 |  | 0.1 |  | 14.3 | 8.8
Severance payments | January 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.1 | 1.4 | 6.7 | 0.0 | 1.4 | 0.0
Accruals |  |  | 0.1 | 8.7 |  |
Cash payments | (0.1) | (1.3) | (3.6) | (2.0) |  |
Ending balance | 0.0 | 0.1 | 3.2 | 6.7 | 0.0 | 3.2
Severance payments | August 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 1.2 | 5.3 |  |  | 5.3 |
Accruals | (0.1) | (0.5) |  |  |  |
Cash payments | (0.5) | (3.6) |  |  |  |
Ending balance | 0.6 | 1.2 |  |  | 0.6 |
Severance payments | May 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 |  |  |  |  |
Accruals | 14.8 |  |  |  |  |
Cash payments | 0.0 |  |  |  |  |
Ending balance | 14.8 | 0.0 |  |  | 14.8 |
Employee benefits |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Accruals | 2.1 |  | (0.2) |  | 2.1 | 0.5
Employee benefits | January 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 | 0.0 | 0.6 | 0.0 | 0.0 | 0.0
Accruals |  |  | (0.2) | 0.7 |  |
Cash payments | 0.0 | 0.0 | (0.1) | (0.1) |  |
Ending balance | 0.0 | 0.0 | $ 0.3 | $ 0.6 | 0.0 | $ 0.3
Employee benefits | August 2023 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.1 | 0.1 |  |  | 0.1 |
Accruals | 0.0 | 0.0 |  |  |  |
Cash payments | (0.1) | 0.0 |  |  |  |
Ending balance | 0.0 | 0.1 |  |  | 0.0 |
Employee benefits | May 2024 Restructuring Plan |  |  |  |  |  |
Restructuring Reserve [Roll Forward] |  |  |  |  |  |
Beginning balance | 0.0 |  |  |  |  |
Accruals | 2.2 |  |  |  |  |
Cash payments | 0.0 |  |  |  |  |
Ending balance | $ 2.2 | $ 0.0 |  |  | $ 2.2 |

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