Equity Equity, Textuals (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Jun. 30, 2012	Mar. 31, 2012	Mar. 31, 2011
Dividends declared per share		$ 0.05	$ 0.05
Dividends, Common Stock, Cash		$ 10.9
Stock Repurchase Program, Authorization Increase		120
Stock Repurchase Program, Authorized Amount		200
Treasury Stock, Shares, Acquired	759,276	6,591,870
Treasury Stock, Value, Acquired, Par Value Method	8.3	73.2
Treasury Stock Acquired, Average Cost Per Share	$ 10.93	$ 11.10
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$ 138.5	$ 146.8