EQUITY (Details) (USD $) In Millions, except Per Share data, unless otherwise specified			6 Months Ended				39 Months Ended
	Jun. 30, 2013	Dec. 31, 2012	Jun. 30, 2013 Common Stock	Jun. 30, 2012 Common Stock	Jun. 30, 2013 Treasury Stock	Jun. 30, 2012 Treasury Stock	Jun. 30, 2013 Treasury Stock
Changes in common shares and treasury stock
Common stock issued, balance at beginning of period	206.7	206.0	206.0	205.1
Treasury stock balance at beginning of period					3.5	1.4
Stock-based compensation			0.7	0.8	0.2	0.2
Treasury stock purchases			0	0	0.6	0.5
Common stock issued, balance at end of period	206.7	206.0	206.7	205.9
Treasury stock balance at end of period					4.3	2.1	4.3
Balance, beginning of period (in dollars )	$ 305.2	$ 244.6			$ 244.6	$ 89.7
Stock-based compensation (in dollars )					17.7	14.8
Treasury stock purchases (in dollars )					42.9	44.0
Balance, end of period (in dollars )	305.2	244.6			305.2	148.5	305.2
Shares authorized to be repurchased March 2010 to date (in dollars)							300.0
Shares repurchased March 2010 to date, shares							3.7
Shares repurchased March 2010 to date, average cost per share							$ 70.69
Remaining repurchased available under the authorization (in dollars)							$ 35.8