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Share-Based Awards (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	6 Months Ended
	Jun. 26, 2015	Jun. 27, 2014	Dec. 26, 2014
Share Based Compensation Arrangement By Share Based Payment Award Options Additional Disclosures [Abstract]
Outstanding, beginning	4,975
Granted	537
Exercised	(109)
Canceled	(11)
Outstanding, ending	5,392
Outstanding Weighted Average Exercise Price	$ 47.81		$ 44.72
Granted, Weighted Average Exercise Price	74.23
Exercised, Weighted Average Exercise Price	34.55
Canceled, Weighted Average Exercise Price	$ 71.93
Options Exercisable	3,726		3,318
Weighted Average Exercise Price of Exercisable Options	$ 37.92		$ 34.86
Share-based compensation expense	$ 11.0	$ 9.8
Unrecognized compensation cost	$ 17.2
Weighted average recognition period	1 year 10 months
Fair Value Assumptions and Methodology [Abstract]
Stock purchase plan discount from market value	15.00%
Employee Stock Purchase Plan Shares Issued	166	193
Total Shares Authorized	10,500
Available for Future Issuance	8,388
Stock Incentive Plan (2015)
Fair Value Assumptions and Methodology [Abstract]
Total Shares Authorized	3,500
Available for Future Issuance	3,460
Employee Stock Purchase Plan (2006)
Fair Value Assumptions and Methodology [Abstract]
Total Shares Authorized	7,000
Available for Future Issuance	4,928
Stock Options
Fair Value Assumptions and Methodology [Abstract]
Expected life	6 years 6 months	6 years 6 months
Interest rate	1.70%	2.00%
Volatility	35.10%	36.10%
Dividend yield	1.60%	1.50%
Weighted average fair value per share	$ 23.22	$ 24.83
Employee Stock Purchase Plan (2006)
Fair Value Assumptions and Methodology [Abstract]
Expected life	1 year	1 year
Interest rate	0.20%	0.10%
Volatility	18.90%	21.40%
Dividend yield	1.60%	1.40%
Weighted average fair value per share	$ 16.51	$ 17.81

X

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Discount rate from fair value on offering date that participants pay for shares.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

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Weighted average price of options that were either forfeited or expired.

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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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