Annual report pursuant to Section 13 and 15(d)

BENEFIT PLANS - Net Amounts Recognized, or Funded Status of Pension and Other Postretirement Benefit Plans (Details)

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BENEFIT PLANS - Net Amounts Recognized, or Funded Status of Pension and Other Postretirement Benefit Plans (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (100.1) $ (100.4)
Pension Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (6.7) (6.7)
Long-term liabilities (95.9) (95.4)
Funded status of plan (102.6) (102.1)
Other Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.9 0.0
Current liabilities (0.1) (0.1)
Long-term liabilities (1.2) (2.0)
Funded status of plan $ (0.4) $ (2.1)