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Share-Based Awards, Purchase Plans and Compensation Cost (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 25, 2020 | Dec. 27, 2019
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Award expiration period | 10 years |  |
Stock Appreciation Plan Expense | $ 3.1 | $ 2.4 | $ 3.3
Intrinsic value of exercisable option shares | $ 342.0 |  |
Exercisable option weighted average contractual term | 4 years 10 months 24 days |  |
Share options vested and expected to vest | 9,600,000 |  |
Aggregate intrinsic value of share options vested and expected to vest | $ 395.6 |  |
Weighted average exercise price of share options vested and expected to vest (per share) | $ 39.31 |  |
Weighted average contractual term of share options vested and expected to vest | 5 years 8 months 12 days |  |
Employee stock purchase plan shares granted | 415,995 | 399,567 | 397,833
Unrecognized compensation cost related to unvested options | $ 9.8 |  |
Weighted average recognition period for unvested options | 2 years 4 months 24 days |  |
Stock Incentive Plan (2019) | Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Shares issued under the plan | 12,070 | 15,243 | 15,016
Employee Stock Purchase Plan (2006) |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Share purchase price as percentage of fair value | 85.00% |  |
Stock purchase plan discount percentage | 15.00% |  |
Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Award vesting period | 3 years |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |
Award vesting period | 4 years |  |

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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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