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Accumulated Other Comprehensive Income (Loss) - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) Included in Computation of Net Periodic Pension and Post-employment Benefit Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |  |  |  |
Prior service cost | $ 0.0 | $ 0.2 | $ 0.1 | $ 0.3
Actuarial gains | (0.7) | (0.7) | (1.3) | (1.3)
Total before tax | (0.7) | (0.5) | (1.2) | (1.0)
Tax expense | 0.2 | 0.1 | 0.3 | 0.2
Net of tax | $ (0.5) | $ (0.4) | $ (0.9) | $ (0.8)

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