Capital Stock (Tables)

6 Months Ended

Jun. 30, 2014

Capital [Abstract]

Summary of Cash Dividend Activity

A summary of the cash dividend activity for the six months ended June 30, 2014 and 2013 is as follows:

Declaration Date	Record Date	Payment Date	Cash Dividend per Share	Total
Six Months Ended June 30, 2014
January 28, 2014	March 10, 2014	March 25, 2014	$0.4375	$123.4
April 29, 2014	June 10, 2014	June 25, 2014	$0.4375	$120.5
Six Months Ended June 30, 2013
February 20, 2013	March 8, 2013	March 25, 2013	$0.3750	$113.4
May 15, 2013	June 10, 2013	June 25, 2013	$0.3750	$112.7

Summary of Share Repurchases

A summary of common stock repurchases for the period July 1, 2014 through July 15, 2014 (subsequent to June 30, 2014) and for the six months ended June 30, 2014 and 2013 is as follows:

	July 1, 2014   Through   July 15, 2014		Six Months Ended   June 30
			2014		2013
Shares repurchased	0.4		22.6		9.1
Average price per share	$	108.98	$	92.10	$	67.31
Aggregate cost	$	41.3	$	2,077.2	$	615.5
Authorization remaining at the end of each period	$	1,572.1	$	1,613.4	$	1,221.3

Summary of Stock Option Activity

A summary of stock option activity for the six months ended June 30, 2014 is as follows:

	Number of Shares		Weighted- Average Option Price per Share		Weighted- Average Remaining Contractual Life (Years)	Aggregate Intrinsic Value
Outstanding at January 1, 2014	10.0		$	65.38
Granted	1.8		90.19
Exercised	(2.7	)	66.69
Forfeited or expired	(0.3	)	67.63
Outstanding at June 30, 2014	8.8		69.95		3.8	$	333.0
Exercisable at June 30, 2014	5.5		65.47		2.4	$	232.6

Summary of Nonvested Restricted Stock Activity Including Restricted Stock Units

A summary of the status of nonvested restricted stock activity, including restricted stock units, for the six months ended June 30, 2014 is as follows:

	Restricted Stock Shares and Units		Weighted- Average Grant Date Fair Value per Share
Nonvested at January 1, 2014	4.2		$	63.83
Granted	1.4		90.17
Vested	(1.7	)	64.17
Forfeited	(0.3	)	66.83
Nonvested at June 30, 2014	3.6		73.46

Schedule of Fair Values of Options Granted During The Period Estimated Using Weighted-Average Assumptions

The following weighted-average assumptions were used to estimate the fair values of options granted during the six months ended June 30, 2014 and 2013:

	2014		2013
Risk-free interest rate	2.16	%	1.25	%
Volatility factor	35.00	%	35.00	%
Quarterly dividend yield	0.50	%	0.60	%
Weighted-average expected life (years)	3.75		4.00

Schedule of Weighted-Average Fair Values Determined For The Periods

The following weighted-average fair values were determined for the six months ended June 30, 2014 and 2013:

	2014		2013
Options granted during the period	$	22.37	$	14.53
Restricted stock awards granted during the period	90.17		62.46