POSTRETIREMENT BENEFITS (Details Textuals) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Shareholders' Equity Charges
Pretax amount of after-tax (benefit) charge recorded in shareholders' equity	$ 138.9	$ 14.4	$ 162.0
Defined Benefit Plan, Amortization of Net Losses	31
Other Postretirement Benefit Plans, Defined Benefit
Shareholders' Equity Charges
After-tax (benefit) charge to shareholders' equity for other postretirement plans	1.8	(1.2)
Pretax amount of after-tax (benefit) charge recorded in shareholders' equity	3.1	(1.9)	4.8
Defined Benefit Plan, Amortization of Net Losses	4
Par outstanding value of non-callable zero coupon bond used to determine the hypothetical yield curve	250
Defined Benefit Plan, Expected Future Benefit Payments in Year One	5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Two	5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Three	5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Four	5.0
Defined Benefit Plan, Expected Future Benefit Payments in Year Five	$ 5.0