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, 2017
Dec. 31, 2016
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (175.8) $ (184.4)
Pension Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (5.4) (4.2)
Long-term liabilities (165.1) (174.1)
Funded status of plan (170.5) (178.3)
Other Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (0.2) (0.2)
Long-term liabilities (6.9) (5.7)
Funded status of plan $ (7.1) $ (5.9)