Employee Benefit Plan Obligations Estimated amounts to be amortized from AOCI into net periodic benefit cost over the next fiscal year (Details) - USD ($) $ in Millions	Feb. 28, 2020	May 24, 2019	Feb. 22, 2019
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	$ (1.1)		$ (0.4)
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year	(0.1)		(0.1)
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	1.0		0.3
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Expected Amortization of Gain (Loss), Next Fiscal Year	2.1		3.4
Defined Benefit Plan, Expected Amortization of Prior Service Cost (Credit), Next Fiscal Year		$ 0.0	0.0
Defined Benefit Plan, Expected Amortization, Next Fiscal Year	$ (2.1)		$ (3.4)