Income Taxes (Schedule of changes in total gross unrecognized tax benefit liabilities, excluding accrued interest) (Details) - USD ($) $ in Millions	12 Months Ended
May 31, 2020	May 26, 2019
Changes in total gross unrecognized tax benefit liabilities [Roll Forward]
Balance, beginning of year	$ 139.1	$ 196.3
Current year additions	18.7	19.5
Current year reductions	0.0	(0.1)
Prior years additions	2.3	3.8
Prior years reductions	(6.0)	(13.2)
Prior years settlements	(2.9)	(41.0)
Lapses in statutes of limitations	(3.3)	(26.2)
Balance, end of year	$ 147.9	$ 139.1

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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Amount of unrecognized tax benefits.

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

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