Share-Based Payments Weighted Average Assumptions (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 29, 2012
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as a percent)	2.29%	1.43%	1.50%
Dividend yield (as a percent)	2.57%	2.88%	2.99%
Weighted-average volatility (as a percent)	25.59%	25.02%	25.86%
Weighted-average fair market value (in dollars per share)	$ 12.78	$ 8.39	$ 8.09
Performance shares (PSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Risk-free interest rate (as a percent)	0.72%	0.33%
Dividend yield (as a percent)	2.57%	2.88%
Expected term, minimum (in years)	2 years 9 months 18 days	2 years 9 months 18 days
Granted, weighted-average grant date fair value (in dollars per unit)	$ 58.69	$ 43.10
Volatility rate	21.72%	21.13%
Awards granted in period	0.2	0.2
Performance shares (PSUs) | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility rate	12.45%	12.18%
Performance shares (PSUs) | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Volatility rate	72.41%	69.37%
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards granted in period	0.2	0.2	0.3