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Impairment and restructuring charges - Schedule of Impairment of Long-Lived Assets Held and Used by Asset (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2024 | Jun. 30, 2024 | Sep. 30, 2023 | Jun. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment of long-lived assets | $ 0.0 | $ 27.2 | $ 0.0 | $ 306.7 | $ 27.2 | $ 306.7
Buildings, building improvements and leasehold improvements |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | 7.8 | 81.5
Furniture and equipment |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | 14.1 | 117.5
Software |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | 0.2 | 0.3
Construction-in-progress |  |  |  |  |  |
Impaired Long-Lived Assets Held and Used [Line Items] |  |  |  |  |  |
Impairment of long-lived assets |  |  |  |  | $ 5.1 | $ 107.4

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