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PENSION AND POST-RETIREMENT BENEFITS - Projected Benefit Obligation, Accumulated Benefit Obligation, and Fair Value of Plan Assets (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Retirement Benefits [Abstract]
Projected benefit obligation	$ 666.5	$ 629.7
Accumulated benefit obligation	663.6	627.9
Fair value of plan assets	$ 463.0	$ 462.4

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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