PENSION AND POST-RETIREMENT PLANS - FAIR VALUE (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Pension and Post-retirement Plans
Total	$ 241.2	$ 227.9	$ 206.3
Fair Value Measurement
Pension and Post-retirement Plans
Total	198.6	186.3
Total plan assets	241.2	227.9
Fair Value Measurement | Cash
Pension and Post-retirement Plans
Total	5.1	6.1
Fair Value Measurement | U S large-cap
Pension and Post-retirement Plans
Total	90.9	82.8
Fair Value Measurement | U S mid and small-cap
Pension and Post-retirement Plans
Total	50.2	46.0
Fair Value Measurement | International large-cap
Pension and Post-retirement Plans
Total	7.1	7.1
Fair Value Measurement | U S Treasuries
Pension and Post-retirement Plans
Total	20.0	19.2
Fair Value Measurement | Municipal bonds
Pension and Post-retirement Plans
Total	0.2	0.2
Fair Value Measurement | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	24.9	24.7
Fair Value Measurement | Convertible Bonds
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | International Fixed Income
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)
Pension and Post-retirement Plans
Total	166.2	142.0
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Cash
Pension and Post-retirement Plans
Total	5.1	6.1
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S large-cap
Pension and Post-retirement Plans
Total	90.9	82.8
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S mid and small-cap
Pension and Post-retirement Plans
Total	50.2	46.0
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | International large-cap
Pension and Post-retirement Plans
Total	7.1	7.1
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S Treasuries
Pension and Post-retirement Plans
Total	12.9
Fair Value Measurement | Significant Observable Inputs (Level 2)
Pension and Post-retirement Plans
Total	32.4	44.3
Fair Value Measurement | Significant Observable Inputs (Level 2) | U S Treasuries
Pension and Post-retirement Plans
Total	7.1	19.2
Fair Value Measurement | Significant Observable Inputs (Level 2) | Municipal bonds
Pension and Post-retirement Plans
Total	0.2	0.2
Fair Value Measurement | Significant Observable Inputs (Level 2) | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	24.9	24.7
Fair Value Measurement | Significant Observable Inputs (Level 2) | Convertible Bonds
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | Significant Observable Inputs (Level 2) | International Fixed Income
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | Investment measured at NAV
Pension and Post-retirement Plans
Total	$ 42.6	$ 41.6