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Equity (Details) (USD $)
In Millions, except Share data, unless otherwise specified
9 Months Ended
Sep. 30, 2013
Mar. 31, 2013
Equity [Abstract]    
Common stock issued under stock compensation plan (in shares) 1,654,477  
Increase in cash dividend rate (in dollars per share)   $ 0.01
Dividends payable (in dollars per share) $ 0.14 $ 0.14
Dividends payable $ 20.3