Debt (Components Of Long-Term Debt) (Details) - USD ($) $ in Millions	12 Months Ended
May. 31, 2015	May. 25, 2014
Debt Instruments [Line Items]
Total long-term debt	$ 1,478.0	$ 2,500.0
Fair value hedge	3.6	1.6
Less unamortized discount and issuance costs	(14.3)	(23.2)
Total long-term debt less unamortized discount and issuance costs	1,467.3	2,478.4
Less current portion	(15.0)	(15.0)
Long-term debt, excluding current portion	1,452.3	2,463.4
7.125% debentures due February 2016
Debt Instruments [Line Items]
Total long-term debt	$ 0.0	100.0
Debt instrument, interest rate, stated percentage (percentage)	7.125%
Maturity date of debt	Feb. 29, 2016
Variable-rate term loan (1.68% at May 31, 2015) due August 2017
Debt Instruments [Line Items]
Total long-term debt	$ 285.0	300.0
Debt instrument, interest rate, stated percentage (percentage)	1.68%
Maturity date of debt	Aug. 31, 2017
6.200% senior notes due October 2017
Debt Instruments [Line Items]
Total long-term debt	$ 500.0	500.0
Debt instrument, interest rate, stated percentage (percentage)	6.20%
Maturity date of debt	Oct. 31, 2017
3.790% senior notes due August 2019
Debt Instruments [Line Items]
Total long-term debt	$ 0.0	80.0
Debt instrument, interest rate, stated percentage (percentage)	3.79%
Maturity date of debt	Aug. 31, 2019
4.500% senior notes due October 2021
Debt Instruments [Line Items]
Total long-term debt	$ 121.9	400.0
Debt instrument, interest rate, stated percentage (percentage)	4.50%
Maturity date of debt	Oct. 31, 2021
3.350% senior notes due November 2022
Debt Instruments [Line Items]
Total long-term debt	$ 111.1	450.0
Debt instrument, interest rate, stated percentage (percentage)	3.35%
Maturity date of debt	Nov. 30, 2022
4.520% senior notes due August 2024
Debt Instruments [Line Items]
Total long-term debt	$ 10.0	220.0
Debt instrument, interest rate, stated percentage (percentage)	4.52%
Maturity date of debt	Aug. 31, 2024
6.000% senior notes due August 2035
Debt Instruments [Line Items]
Total long-term debt	$ 150.0	150.0
Debt instrument, interest rate, stated percentage (percentage)	6.00%
Maturity date of debt	Aug. 31, 2035
6.800% senior notes due October 2037
Debt Instruments [Line Items]
Total long-term debt	$ 300.0	$ 300.0
Debt instrument, interest rate, stated percentage (percentage)	6.80%
Maturity date of debt	Oct. 31, 2037

Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer.

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-Name Accounting Standards Codification

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Contractual interest rate for funds borrowed, under the debt agreement.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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Fair value as of the balance sheet date of all derivative liabilities designated as interest rate fair value hedging instruments.

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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