PENSION AND POSTRETIREMENT PLANS (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Postemployment Benefits [Abstract]
Minimum non-elective contribution (NEC) % for the 401(K) plan (in hundredths)	3.00%
Discretionary contribution % for the 401(K) plan, range mininum	1.00%
Discretionary contribution % for the 401(K) plan, range maximum	3.00%
Defined contribution retirement plan cost	$ 12.5	$ 11.7
Defined Benefit Plan Disclosures [Line Items]
Pension Contributions	1.2
Defined Benefit Plans [Member]
Defined Benefit Plan Disclosures [Line Items]
Service cost for benefits earned	0.6	0.6
Interest cost on benefit obligation	3.7	4.4
Expected return on plan assets	(4.4)	(4.5)
Net amortization and deferral	3.1	1.7
Defined benefit plan costs	3.0	2.2
Post-Retirement Medical Plan [Member]
Defined Benefit Plan Disclosures [Line Items]
Service cost for benefits earned	0.1	0.1
Interest cost on benefit obligation	0.6	0.6
Net amortization and deferral	0	0
Defined benefit plan costs	$ 0.7	$ 0.7