SHAREHOLDERS' EQUITY (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Jul. 21, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options exercised (in shares)	508,247	200,000	0
Total value of stock options exercised	$ 9.3	$ 3.1	$ 0.2
Shares issued in connection with CEOP Plan (in shares)	0	500,000	1,300,000
Value of common shares for issued CEOP	0	10.2	16.9
Authorized share repurchase program (in shares)				5,000,000
Stock repurchase program period in force (in years)				3
Common stock repurchased and retired (in shares)	200,000
Value of common stock repurchased and retired	4.2
Remaining shares authorized to be purchased (in shares)	4,800,000
Foreign currency translation adjustment [Roll Forward]
Beginning balance	0.4	(0.5)	(5.1)
Unrealized gains (losses)	1.4	0.9	4.6
Ending balance	1.8	0.4	(0.5)
Unrealized gains (losses) on derivative contracts (net of taxes) [Roll Forward]
Beginning balance	11.6	11.6	(25.0)
Unrealized gains (losses)	(10.6)	5.4	24.2
Reclassification adjustments into income	(6.3)	(5.4)	12.4
Ending balance	(5.3)	11.6	11.6
Pension and postretirement benefits (net of taxes) [Roll Forward]
Beginning balance	(273.8)	(259.3)	(239.3)
Unrealized gains (losses)	(29.0)	(26.0)	(27.3)
Reclassification adjustments into income	12.1	11.5	7.3
Ending balance	(290.7)	(273.8)	(259.3)
Accumulated other comprehensive loss [Roll Forward]
Beginning balance	(261.8)	(248.2)	(269.4)
Unrealized gains (losses)	(38.2)	(19.7)	1.5
Reclassification adjustments into income	5.8	6.1	19.7
Ending balance	(294.2)	(261.8)	(248.2)
Deferred tax (benefit) provision on unrealized gains and losses on derivative contracts	(10.7)	0	23.2
Deferred tax (benefit) provision on pension and postretirement benefits	$ 10.2	$ 9.1	$ 9.7