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Defined contribution and defined benefit retirement plans - Schedule of Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) (Details) - Pension plans defined benefit - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Pension Plans Postretirement And Other Employee Benefits [Line Items] |  |  |
Net actuarial gains (losses) | $ 16.0 | $ (25.5) | $ 134.1
Amortization of unrecognized net actuarial losses | 3.7 | 3.8 | 14.7
Amortization of unrecognized prior service cost (credit) | 0.1 |  | 0.1
Settlements | 0.4 | 6.5 | 0.4
Total | $ 20.2 | $ (15.2) | $ 149.3

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