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PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS - Net Amounts Recognized (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2024
Dec. 31, 2023
Net amounts recognized in the balance sheets at December 31      
Benefit obligations $ 193.0 $ 193.0 $ 197.0
Cash contributions and benefit payments to unfunded plans 1.2 3.7  
Additional cash contributions, including benefit payments to unfunded plans $ 5.5 $ 5.5