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Stock Repurchase Plan (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Stock Repurchase Plan (Details) [Abstract]
Authorized aggregate amount	$ 800.0
Total number of shares repurchased since inception of our stock repurchase program (shares)	29,322,753	23,470,345
Aggregate purchase price of shares repurchased since inception of our stock repurchase program	715.5	551.2
Number of shares repurchased (shares)	5,852,408
Purchase price of shares repurchased	$ 164.3

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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