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Capital Stock (Summary of Share Repurchases) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	3 Months Ended
	Apr. 12, 2012	Mar. 31, 2012	Mar. 31, 2011
Capital Stock [Abstract]
Shares repurchased	1.1	10.2	11.4
Average price per share price	$ 71.91	$ 66.80	$ 65.29
Aggregate cost	$ 76.0	$ 679.8	$ 741.6
Authorization remaining at the end of each period	$ 3,577.9	$ 3,653.9	$ 882.0

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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- Definition

Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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