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Post Retirement Benefit Plans - AOCI (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Pre-tax amounts recognized in accumulated other comprehensive income: |  |  |
Prior service cost | $ 0.2 | $ 14.6 | $ 12.0
Net actuarial gain (loss) | (38.9) | (27.4) | 4.2
Accumulated other comprehensive gain (loss) | (38.7) | (12.8) | 16.2
Accumulated contributions in excess of net periodic benefit cost | (66.8) | (65.9) | (63.7)
Net amount recognized | (105.5) | $ (78.7) | $ (47.5)
Accumulated other comprehensive income expected to be recognized as amortization of net loss within net periodic benefit cost in 2024 | $ 0.4 |  |

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