EMPLOYEE BENEFITS (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended																																																12 Months Ended
	Dec. 31, 2011 Level 2 Hedge fund D	Dec. 31, 2011 Pension Benefits	Dec. 31, 2010 Pension Benefits	Dec. 31, 2009 Pension Benefits	Dec. 31, 2011 Pension Benefits Cash and cash equivalents	Dec. 31, 2010 Pension Benefits Cash and cash equivalents	Dec. 31, 2011 Pension Benefits Equity securities: U.S. large-cap	Dec. 31, 2010 Pension Benefits Equity securities: U.S. large-cap	Dec. 31, 2011 Pension Benefits Equity securities: U.S. mid-cap growth	Dec. 31, 2010 Pension Benefits Equity securities: U.S. mid-cap growth	Dec. 31, 2011 Pension Benefits Equity securities: U.S. small-cap growth	Dec. 31, 2010 Pension Benefits Equity securities: U.S. small-cap growth	Dec. 31, 2011 Pension Benefits Equity securities: Emerging markets	Dec. 31, 2010 Pension Benefits Equity securities: Emerging markets	Dec. 31, 2011 Pension Benefits Equity securities: Real estate investment trusts	Dec. 31, 2010 Pension Benefits Equity securities: Real estate investment trusts	Dec. 31, 2011 Pension Benefits Equity securities: International large-cap value	Dec. 31, 2010 Pension Benefits Equity securities: International large-cap value	Dec. 31, 2011 Pension Benefits Hedge fund	Dec. 31, 2011 Pension Benefits Fixed income securities: Government bonds	Dec. 31, 2010 Pension Benefits Fixed income securities: Government bonds	Dec. 31, 2011 Pension Benefits Fixed income securities: Corporate bonds	Dec. 31, 2010 Pension Benefits Fixed income securities: Corporate bonds	Dec. 31, 2011 Pension Benefits Level 1	Dec. 31, 2010 Pension Benefits Level 1	Dec. 31, 2011 Pension Benefits Level 1 Cash and cash equivalents	Dec. 31, 2010 Pension Benefits Level 1 Cash and cash equivalents	Dec. 31, 2010 Pension Benefits Level 1 Fixed income securities: Government bonds	Dec. 31, 2011 Pension Benefits Level 2	Dec. 31, 2010 Pension Benefits Level 2	Dec. 31, 2010 Pension Benefits Level 2 Cash and cash equivalents	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: U.S. large-cap	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: U.S. large-cap	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: U.S. mid-cap growth	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: U.S. mid-cap growth	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: U.S. small-cap growth	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: U.S. small-cap growth	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: Emerging markets	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: Emerging markets	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: Real estate investment trusts	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: Real estate investment trusts	Dec. 31, 2011 Pension Benefits Level 2 Equity securities: International large-cap value	Dec. 31, 2010 Pension Benefits Level 2 Equity securities: International large-cap value	Dec. 31, 2011 Pension Benefits Level 2 Hedge fund	Dec. 31, 2011 Pension Benefits Level 2 Fixed income securities: Government bonds	Dec. 31, 2010 Pension Benefits Level 2 Fixed income securities: Government bonds	Dec. 31, 2011 Pension Benefits Level 2 Fixed income securities: Corporate bonds	Dec. 31, 2010 Pension Benefits Level 2 Fixed income securities: Corporate bonds	Dec. 31, 2011 U.S. Pension Plan
Plan assets, target allocation
Public equity (as a percent)																																																	40.00%
Fixed income (as a percent)																																																	60.00%
Fair value of pension plan assets by asset category
Total		$ 280.7	$ 269.4	$ 209.1	$ 14.0	$ 41.0	$ 11.0	$ 16.0	$ 3.2	$ 4.8	$ 1.7	$ 2.7	$ 2.3	$ 4.6	$ 12.7	$ 16.6	$ 26.1	$ 24.9	$ 14.0	$ 53.3	$ 124.9	$ 142.4	$ 33.9	$ 14.0	$ 48.8	$ 14.0	$ 40.0	$ 8.8	$ 266.7	$ 220.6	$ 1.0	$ 11.0	$ 16.0	$ 3.2	$ 4.8	$ 1.7	$ 2.7	$ 2.3	$ 4.6	$ 12.7	$ 16.6	$ 26.1	$ 24.9	$ 14.0	$ 53.3	$ 116.1	$ 142.4	$ 33.9
Period of notice for quarterly redemption of diversified hedge funds (in days)	60