Stock Repurchase Programs (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	1 Months Ended	3 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended	3 Months Ended
	Nov. 30, 2013 November 2013 Stock Plan [Member]	May 03, 2014 November 2013 Stock Plan [Member]	Mar. 31, 2013 March 2013 Stock Plan	May 03, 2014 March 2013 Stock Plan	May 04, 2013 March 2013 Stock Plan	Feb. 29, 2012 2012 Stock Plan	May 04, 2013 2012 Stock Plan
Stock Repurchase Programs
Stock repurchase authorization	$ 250,000,000		$ 250,000,000			$ 250,000,000
Number of shares repurchased		0.3		0.5	0.3		1.2
Amount of shares repurchased		25,500,000		40,400,000	22,700,000		92,000,000
Average price of shares repurchased (in dollars per share)		$ 89.82		$ 89.04	$ 79.04		$ 79.14
Repurchase of common stock remaining authorization		$ 224,500,000		$ 0