Stock Split (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	Jun. 30, 2012	May 31, 2012	Nov. 30, 2011	Aug. 03, 2012	Jun. 29, 2012	May 24, 2012	Oct. 31, 2011	Jul. 29, 2011
Stock Split
Common stock split, conversion ratio	2	2	2
Percentage of common stock dividend distributed as a result of stock split					100.00%
Shares issued to stockholders as a result of common stock split		29.4
Common stock, par value (in dollars per share)				$ 1.00		$ 1.00	$ 1.00	$ 1.00
Value of shares transferred from retained earnings to common stock		$ 29.4