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PENSION AND POST-RETIREMENT PLANS - COMPONENTS OF NET PERIODIC BENEFIT COST (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income, net of tax: |  |
Amortization of net loss (gain) | $ (0.8) | $ (1.2)
Amortization of prior service credit | 0.9 | 1.1
Pension Benefits |  |
Components of Net Periodic Benefit Cost (Benefit): |  |
Service cost | 1.2 | 1.2
Interest cost | 1.7 | 1.5
Expected return on plan assets | (3.9) | (3.6)
Amortization of net loss | 0.8 | 1.3
Amortization of prior service credit | (0.3) | (0.6)
Net periodic benefit cost (benefit) | (0.5) | (0.2)
Post-retirement benefits |  |
Components of Net Periodic Benefit Cost (Benefit): |  |
Service cost | 0.2 | 0.2
Interest cost | 0.2 | 0.2
Amortization of net loss | 0.2 | 0.3
Amortization of prior service credit | (0.9) | (0.9)
Net periodic benefit cost (benefit) | $ (0.3) | $ (0.2)

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