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Earnings Per Share and Capital Structure Stock Repurchase Plan (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended	5 Months Ended
	Oct. 24, 2011	Mar. 31, 2012	Mar. 31, 2012
Stock Repurchase Program, Authorized Amount	$ 100
Shares repurchased to date			40
Stock Repurchase Program, Remaining Authorized Repurchase Amount		$ 60

Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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