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Capital Stock (Summary of Share Repurchases) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	0 Months Ended	9 Months Ended
	Oct. 10, 2013	Sep. 30, 2013	Sep. 30, 2012
Capital [Abstract]
Shares repurchased	0.9	15.6	28.6
Average price per share price	$ 85.28	$ 74.86	$ 63.85
Aggregate cost	$ 72.7	$ 1,170.4	$ 1,828.8
Authorization remaining at the end of each period	$ 4,093.8	$ 4,166.5	$ 2,504.9

The cash outflow to reacquire common stock during the period.

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- Definition

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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