EQUITY (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended			12 Months Ended
	Feb. 28, 2009	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2011 Common Stock	Dec. 31, 2010 Common Stock	Dec. 31, 2009 Common Stock	Dec. 31, 2011 Treasury Stock	Dec. 31, 2010 Treasury Stock
Changes in common shares and treasury stock
Common stock issued, balance at beginning of period		205.1	204.8	204.8	204.5
Treasury stock balance at beginning of period							0.1
IPO	34.5					204.5
Stock-based compensation				0.3	0.3			0.1
Treasury stock purchases							1.3
Common stock issued, balance at end of period		205.1	204.8	205.1	204.8	204.5
Treasury stock balance at end of period							1.4	0.1
Balance, beginning of period (in dollars)		$ 89.7	$ 3.2				$ 3.2
Stock-based compensation (in dollars)							4.9	3.1
Treasury stock purchases (in dollars)							81.6	0.1
Balance, end of period (in dollars)		$ 89.7	$ 3.2				$ 89.7	$ 3.2