PENSION AND POSTRETIREMENT PLANS, OTHER DISCLOSURES (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
Defined Benefit Plan, Effect of One-Percentage Point Change in Assumed Health Care Cost Trend Rates [Abstract]
Impact of a percentage point increase each year in the assumed health care cost trend rate on the accumulated post-retirement benefit obligation	$ 9.4
Impact of a percentage point decrease each year in the assumed health care cost trend rate on the accumulated post-retirement benefit obligation	7.7
Impact of a percentage point increase each year in the assumed health care cost trend rate on the service and interest cost components	0.4
Impact of a percentage point decrease each year in the assumed health care cost trend rate on the service and interest cost components	0.3
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans, Estimated Future Benefit Payments [Abstract]
Benefit payments expected in 2012	1.9
Benefit payments expected in 2013	1.9
Benefit payments expected in 2014	2.0
Benefit payments expected in 2015	2.2
Benefit payments expected in 2016	2.3
Benefit payments expected in 2017-2021	13.4
Defined Benefit Plans [Member]
Defined Benefit Plans, Estimated Future Benefit Payments [Abstract]
Benefit payments expected in 2012	23.8
Benefit payments expected in 2013	23.2
Benefit payments expected in 2014	22.9
Benefit payments expected in 2015	23.2
Benefit payments expected in 2016	23.6
Benefit payments expected in 2017-2021	$ 119.3