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Defined benefit pension plans - Components of Net Periodic Defined Benefit Pension Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024
Defined benefit pension plans [Line Items] |  |  |  |  |
Service cost | $ 1.5 | $ 1.6 | $ 4.4 | $ 4.9 |
Interest cost | 6.0 | 5.3 | 17.3 | 15.9 |
Expected return on plan assets | (6.1) | (5.5) | (17.5) | (16.7) |
Recognized net actuarial losses | 0.8 | 1.0 | 2.4 | 2.9 |
Total | 2.2 | $ 2.4 | 6.6 | $ 7.0 |
Defined benefit plan pension asset | 22.0 |  | 22.0 |  | $ 19.8
Defined Benefit Pension Plans |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Expected contribution | $ 16.0 |  | $ 16.0 |  |
Defined Benefit Pension Plans | UNITED STATES |  |  |  |  |
Defined benefit pension plans [Line Items] |  |  |  |  |
Defined benefit plan benefit obligation |  |  |  |  | 65.2
Defined benefit plan fair value of plan assets |  |  |  |  | 75.7
Defined benefit plan pension asset |  |  |  |  | $ 10.7

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