SIGNIFICANT ACCOUNTING POLICIES GOODWILL AND INTANGIBLE ASSETS (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life, Minimum	3
Finite-Lived Intangible Assets, Useful Life, Maximum	12
Finite-Lived Intangible Assets, Amortization Expense	$ 12.4	$ 10.9	$ 7.7
Permits [Member]
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Useful Life, Minimum	5
Finite-Lived Intangible Assets, Useful Life, Maximum	30
Waste Facilities [Member]
Finite-Lived Intangible Assets [Line Items]
Facilities	1