Income Taxes (Schedule of Unrecognized Tax Benefit Activity) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 27, 2019	Dec. 28, 2018	Dec. 29, 2017
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of period	$ 287.7	$ 182.5	$ 118.7
Additions related to current year tax positions	123.5	19.6	79.9
Additions related to prior period tax positions	19.2	125.1	0.3
Reductions related to prior period tax positions	(5.7)	(32.7)	(13.6)
Settlements	(1.0)	(2.0)	0.0
Lapse of statute of limitations	(25.1)	(4.8)	(2.8)
Balance at end of period	$ 398.6	$ 287.7	$ 182.5

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

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- Definition

Amount of unrecognized tax benefits.

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Amount of decrease in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of decrease in unrecognized tax benefits resulting from settlements with taxing authorities.

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Amount of increase in unrecognized tax benefits resulting from tax positions that have been or will be taken in current period tax return.

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