Share Plans (Schedule of Share Option Award Status Upon Completion of the Conversion) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017	Dec. 30, 2016
Share-based Payment Arrangement [Abstract]
Share options outstanding	6,890,700	7,007,051	4,643,984	3,386,694
Weighted-average exercise price, outstanding share options	$ 36.39	$ 38.74	$ 57.78	$ 61.24
Weighted-average remaining contractual term, outstanding share options	1 year 7 months 6 days
Aggregate intrinsic value, outstanding share options	$ 0.0
Share options exerciseable	3,349,227
Weighted-average exercise price, exercisable share options	$ 49.80
Weighted-average remaining contractual term, exercisable share options	1 year 2 months 12 days
Aggregate intrinsic value, exercisable share options	$ 0.0

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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.

+ 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 (c)(1)(iii)
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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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