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, 2016
Dec. 31, 2015
Amounts recognized in the statements of financial position consist of:    
Long-term liabilities $ (184.4) $ (146.4)
Pension Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 0.0
Current liabilities (4.2) (4.2)
Long-term liabilities (174.1) (139.6)
Net amount recognized (178.3) (143.8)
Other Benefits    
Amounts recognized in the statements of financial position consist of:    
Noncurrent assets 0.0 1.5
Current liabilities (0.2) (0.2)
Long-term liabilities (5.7) (2.0)
Net amount recognized $ (5.9) $ (0.7)