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, 2018
Dec. 31, 2017
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (139.3) $ (175.8)
Pension Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (5.6) (5.4)
Long-term liabilities (126.6) (165.1)
Funded status of plan (132.2) (170.5)
Other Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (0.1) (0.2)
Long-term liabilities (7.9) (6.9)
Funded status of plan $ (8.0) $ (7.1)