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Retirement Plans - Components of Net Periodic Benefit Cost (Credit) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Interest cost | $ 0.1 | $ 0.1 | $ 0.3 | $ 0.3
Prior service cost | (0.2) | (0.2) | (0.6) | (0.6)
Total benefit cost | (0.1) | (0.1) | (0.3) | (0.3)
Defined Benefit Pension Plan |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 4.0 | 4.2 | 11.4 | 12.3
Interest cost | 5.2 | 4.8 | 14.9 | 14.4
Expected return on assets | (5.4) | (4.8) | (15.4) | (14.1)
Net loss (gain) | (0.0) | (0.3) | 0.2 | (1.1)
Prior service cost | 0.2 | 0.2 | 0.5 | 0.5
Curtailments | (0.0) | (0.0) | (0.0) | (1.3)
Total benefit cost | $ 4.0 | $ 4.1 | $ 11.6 | $ 10.7

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