PENSION AND POST-RETIREMENT PLANS - FAIR VALUE (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Pension and Post-retirement Plans
Total	$ 258.9	$ 241.2	$ 227.9
Fair Value Measurement
Pension and Post-retirement Plans
Total	211.2	198.6
Total plan assets	258.9	241.2
Fair Value Measurement | Cash
Pension and Post-retirement Plans
Total	9.4	5.1
Fair Value Measurement | U S large-cap
Pension and Post-retirement Plans
Total	92.8	90.9
Fair Value Measurement | U S mid and small-cap
Pension and Post-retirement Plans
Total	52.3	50.2
Fair Value Measurement | International large-cap
Pension and Post-retirement Plans
Total	7.8	7.1
Fair Value Measurement | U S Treasuries
Pension and Post-retirement Plans
Total	21.9	20.0
Fair Value Measurement | Short-term TIPS
Pension and Post-retirement Plans
Total	0.2
Fair Value Measurement | Municipal bonds
Pension and Post-retirement Plans
Total		0.2
Fair Value Measurement | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	26.6	24.9
Fair Value Measurement | Convertible Bonds
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | International Fixed Income Securities
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	177.2	166.2
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Cash
Pension and Post-retirement Plans
Total	9.4	5.1
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S large-cap
Pension and Post-retirement Plans
Total	92.8	90.9
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S mid and small-cap
Pension and Post-retirement Plans
Total	52.3	50.2
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | International large-cap
Pension and Post-retirement Plans
Total	7.8	7.1
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S Treasuries
Pension and Post-retirement Plans
Total	14.7	12.9
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Short-term TIPS
Pension and Post-retirement Plans
Total	0.2
Fair Value Measurement | Significant Observable Inputs (Level 2)
Pension and Post-retirement Plans
Total	34.0	32.4
Fair Value Measurement | Significant Observable Inputs (Level 2) | U S Treasuries
Pension and Post-retirement Plans
Total	7.2	7.1
Fair Value Measurement | Significant Observable Inputs (Level 2) | Municipal bonds
Pension and Post-retirement Plans
Total		0.2
Fair Value Measurement | Significant Observable Inputs (Level 2) | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	26.6	24.9
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 Securities
Pension and Post-retirement Plans
Total	0.1	0.1
Fair Value Measurement | Investment measured at NAV
Pension and Post-retirement Plans
Total	$ 47.7	$ 42.6