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)