EMPLOYEE BENEFIT PLANS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Contribution Plans
Employer contribution	$ 20.4	$ 18.9	$ 15.6
Pension Plan
Employee Benefit Plans
Expected rate of return on plan assets (as a percent)	8.00%	8.00%
Period of average annual total return used as basis for expected long-term rate of return	20 years
Actual return on plan assets (as a percent)	22.70%	14.80%
Pension Plan | Domestic Equity Securities
Employee Benefit Plans
Assumed asset allocations (as a percent)	70.00%
Expected rate of return on plan assets (as a percent)	9.20%
Pension Plan | International Equities
Employee Benefit Plans
Assumed asset allocations (as a percent)	10.00%
Expected rate of return on plan assets (as a percent)	6.40%
Pension Plan | Fixed Income Securities
Employee Benefit Plans
Assumed asset allocations (as a percent)	20.00%
Expected rate of return on plan assets (as a percent)	5.40%