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BENEFIT PLANS - PENSION PLANS WITH AN ACCUMULATED BENEFIT OBLIGATION IN EXCESS OF PLAN ASSETS (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Retirement Benefits [Abstract]    
Projected benefit obligation $ 397.6 $ 487.7
Accumulated benefit obligation 371.3 465.0
Fair value of plan assets $ 8.3 $ 149.0