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, 2020
Dec. 31, 2019
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (130.7) $ (118.9)
Pension Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 1.0
Current liabilities (6.8) (6.6)
Long-term liabilities (121.3) (111.2)
Funded status of plan (128.1) (116.8)
Other Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (0.1) (0.1)
Long-term liabilities (4.8) (3.2)
Funded status of plan $ (4.9) $ (3.3)