STOCK-BASED COMPENSATION (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Assumptions used in the model for SARs granted
Expenses recorded for stock-based compensation plans	$ 3,900,000	$ 2,700,000	$ 3,000,000
PLC
Assumptions used in the model for SARs granted
Expenses recorded for stock-based compensation plans	10,300,000	10,200,000	10,200,000
SARs
Assumptions used in the model for SARs granted
Expected volatility (as a percent)	69.40%
Expected risk-free interest rate (as a percent)	2.60%
Expected dividend rate (as a percent)	2.40%
Expected forfeiture rate (as a percent)	0.00%
SARs | PLC
Grant date fair values
Awards issued	0	0
Estimated fair values of awards at grant date			3,300,000
Assumptions used in the model for SARs granted
Vesting period from grant date of half of restricted stock units	5 years
Restricted stock units
Assumptions used in the model for SARs granted
Vesting period from grant date of half of restricted stock units		3 years
Vesting period from grant date of remaining restricted stock units		4 years
Restricted stock units | PLC
Grant date fair values
Awards issued	190,800	175,500
Estimated fair values of awards at grant date	$ 5,400,000	$ 5,000,000