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Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	May 27, 2018	Feb. 22, 2018	May 28, 2017
Debt Instruments [Line Items]
Total long-term debt	$ 939.1		$ 950.0
Less unamortized discount and issuance costs	(12.6)		(13.4)
Total long-term debt less unamortized discount and issuance costs	926.5		936.6
3.850% senior notes due May 2027
Debt Instruments [Line Items]
Total long-term debt	$ 500.0		500.0
Debt instrument, interest rate, stated percentage (percentage)	3.85%
6.000% senior notes due August 2035
Debt Instruments [Line Items]
Total long-term debt	$ 96.3		150.0
Debt instrument, interest rate, stated percentage (percentage)	6.00%
6.800% senior notes due October 2037
Debt Instruments [Line Items]
Total long-term debt	$ 42.8		300.0
Debt instrument, interest rate, stated percentage (percentage)	6.80%
4.550% senior notes due February 2048
Debt Instruments [Line Items]
Total long-term debt	$ 300.0		$ 0.0
Debt instrument, interest rate, stated percentage (percentage)	4.55%	4.55%