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RETIREMENT PLANS - Schedule of Net Periodic Defined Benefit Pension Cost (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Retirement Benefits [Abstract] |  |  |  |
Service Cost | $ 0.7 | $ 0.6 | $ 2.1 | $ 1.6
Interest Cost | 5.5 | 5.3 | 16.5 | 16.1
Expected Return on Plan Assets | (4.6) | (5.0) | (13.8) | (15.0)
Amortization of Prior Service Cost and Net Actuarial Loss | (0.1) | 0.2 | (0.3) | 0.5
Special Termination Benefits | 0.0 | 0.0 | 0.0 | 0.2
Net Periodic Benefit Expense | $ 1.5 | $ 1.1 | $ 4.5 | $ 3.4

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