SHAREHOLDER'S EQUITY SHAREHOLDER'S EQUITY, STOCK SPLIT (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Net Income	$ 40.8	$ 74.2
Common stock, shares outstanding	71,400,000		35,500,000
Basic Earnings Per Share	$ 0.57	$ 1.03
Diluted Earnings Per Share	$ 0.56	$ 1.01
Basic	71,192,000	71,988,000
Diluted	72,659,000	73,682,000
Scenario, Previously Reported [Member]
Net Income		74.2
Basic Earnings Per Share		$ 2.06
Diluted Earnings Per Share		$ 2.01
Basic		35,994,000
Diluted		36,841,000
Scenario, Adjustment [Member]
Net Income		$ 0
Basic Earnings Per Share		$ (1.03)
Diluted Earnings Per Share		$ (1.00)
Basic		35,994,000
Diluted		36,841,000