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Financial Instruments, Risk Management Activities, and Fair Values (Schedule of interest rate hedge in AOCI) (Details)
$ in Millions
12 Months Ended
May 28, 2017
USD ($)
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ (23.0)
5.65% notes due February 15, 2019 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ 0.8
Derivative, Maturity Date Feb. 15, 2019
Debt Instrument, Interest Rate, Stated Percentage 5.65%
3.15% notes due December 15, 2021 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ (45.0)
Derivative, Maturity Date Dec. 15, 2021
Debt Instrument, Interest Rate, Stated Percentage 3.15%
1.0% notes due April 27, 2023 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ (1.4)
Derivative, Maturity Date Apr. 27, 2023
Debt Instrument, Interest Rate, Stated Percentage 1.00%
3.65% notes due February 15, 2024 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ 12.0
Derivative, Maturity Date Feb. 15, 2024
Debt Instrument, Interest Rate, Stated Percentage 3.65%
3.2% notes due February 10, 2027 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ 16.6
Derivative, Maturity Date Feb. 10, 2027
Debt Instrument, Interest Rate, Stated Percentage 3.20%
1.5% notes due April 27, 2027 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ (3.2)
Derivative, Maturity Date Apr. 27, 2027
Debt Instrument, Interest Rate, Stated Percentage 1.50%
5.4% notes due June 15, 2040 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ (12.9)
Derivative, Maturity Date Jun. 15, 2040
Debt Instrument, Interest Rate, Stated Percentage 5.40%
4.15% notes due February 15, 2043 [Member]  
Debt Instrument [Line Items]  
Pre-tax hedge gain (loss) in AOCI $ 10.1
Derivative, Maturity Date Feb. 15, 2043
Debt Instrument, Interest Rate, Stated Percentage 4.15%