PENSION AND POST-RETIREMENT PLANS - FAIR VALUE (Details) - Pension Benefits - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Pension and Post-retirement Plans
Total	$ 238.9	$ 212.8	$ 194.8
Fair Value Measurement
Pension and Post-retirement Plans
Total	195.1	170.9
Total plan assets	239.5	212.8
Fair Value Measurement | Cash
Pension and Post-retirement Plans
Total	10.7	3.8
Fair Value Measurement | U S large-cap
Pension and Post-retirement Plans
Total	80.9	71.3
Fair Value Measurement | U S mid and small-cap
Pension and Post-retirement Plans
Total	61.7	54.3
Fair Value Measurement | International large-cap
Pension and Post-retirement Plans
Total	7.5	7.0
Fair Value Measurement | U S Treasuries
Pension and Post-retirement Plans
Total	9.6	12.0
Fair Value Measurement | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	24.5	22.5
Fair Value Measurement | High-yield U.S. corporate bonds / Non-U.S. Bonds
Pension and Post-retirement Plans
Total	0.2
Fair Value Measurement | Quoted Prices in Active Markets (Level 1)
Pension and Post-retirement Plans
Total	160.8	68.9
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | Cash
Pension and Post-retirement Plans
Total	10.7	3.8
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S large-cap
Pension and Post-retirement Plans
Total	80.9	28.9
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | U S mid and small-cap
Pension and Post-retirement Plans
Total	61.7	36.2
Fair Value Measurement | Quoted Prices in Active Markets (Level 1) | International large-cap
Pension and Post-retirement Plans
Total	7.5
Fair Value Measurement | Significant Observable Inputs (Level 2)
Pension and Post-retirement Plans
Total	34.3	102.0
Fair Value Measurement | Significant Observable Inputs (Level 2) | U S large-cap
Pension and Post-retirement Plans
Total		42.4
Fair Value Measurement | Significant Observable Inputs (Level 2) | U S mid and small-cap
Pension and Post-retirement Plans
Total		18.1
Fair Value Measurement | Significant Observable Inputs (Level 2) | International large-cap
Pension and Post-retirement Plans
Total		7.0
Fair Value Measurement | Significant Observable Inputs (Level 2) | U S Treasuries
Pension and Post-retirement Plans
Total	9.6	12.0
Fair Value Measurement | Significant Observable Inputs (Level 2) | Investment grade U S corporate bonds
Pension and Post-retirement Plans
Total	24.5	22.5
Fair Value Measurement | Significant Observable Inputs (Level 2) | High-yield U.S. corporate bonds / Non-U.S. Bonds
Pension and Post-retirement Plans
Total	0.2
Fair Value Measurement | Investment measured at NAV
Pension and Post-retirement Plans
Total	$ 44.4	$ 41.9