PENSION, OTHER POST RETIREMENT BENEFIT AND PROFIT SHARING PLANS, Defined Contribution Plan (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
401(k) Plan [Abstract]
Maximum percentage of defined compensation matched (in hundredths)		5.00%
Employer matching contributions	$ 8.6	$ 8.6	$ 8.6
Profit sharing contribution percentage of eligible compensation (in hundredths)		2.00%
Description of employees eligible for profit sharing contribution		Eligible employees are those hired after December 31, 2005 who work at least 1,000 hours during the plan year and have attained the age of 21.
Employer profit sharing contributions	$ 1.3	$ 1.3	$ 1.1

- Definition

Description of the terms and benefits provided by the employer's defined contribution plans. A defined contribution plan provides benefits in return for services rendered, provides an individual account for each participant, and has terms that specify how contributions to the individual's account are to be determined rather than the amount of benefits the individual is to receive. Under a defined contribution pension plan, the benefits a participant will receive depend solely on the amount contributed to the participant's account, the returns earned on investments of those contributions, and forfeitures of other participants' benefits that may be allocated to such participant's account. A description of the plan(s) including employee groups covered, the basis for determining contributions, and the nature and effects of significant matters affecting comparability of information for all periods presented.

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