Stock-Based Compensation Long-Term Performance Restricted Stock Unit Award Monte Carlo Pricing Model Assumptions (Details) (Restricted Stock Units (RSUs) [Member], USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted-average fair value	$ 42.51	$ 47.21	$ 54.71	[1]
Long Term Performance Restricted Stock Award [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dividend yield	0.00%
Expected volatility	39.10%
Risk-free interest rate	0.30%
Expected term (years)	2 years 6 months 10 days
Weighted-average fair value	$ 45.03

[1] These restricted stock units include 61,500 shares for the 2011 awards under the Performance Award Agreement, which are eligible for vesting at December 31, 2011.