Income Taxes (Schedule of changes in total gross unrecognized tax benefit liabilities, excluding accrued interest) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
May 26, 2013	May 27, 2012
Income Tax Uncertainties [Abstract]
Balance, beginning of year	$ 231.3	$ 226.2
Current year additions	38.5	23.8
Prior years additions	69.6	24.3
Prior years reductions	(74.0)	(13.4)
Prior years settlements	(39.0)	(6.6)
Lapses in statutes of limitations	(10.2)	(23.0)
Balance, end of year	$ 216.2	$ 231.3

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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