Capital Stock (Share Repurchases) (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended			0 Months Ended	1 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 04, 2014 Subsequent Event [Member]	Feb. 07, 2014 Subsequent Event [Member]
Equity, Class of Treasury Stock [Line Items]
Shares repurchased	20.7	39.7		6.0	5.4
Average price per share	$ 78.08	$ 62.96			$ 84.96
Aggregate cost	$ 1,620.1	$ 2,496.8	$ 3,039.8		$ 457.6
Authorization remaining at the end of each period	$ 3,691.0	$ 1,836.9			$ 2,633.4