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Employee Benefit Plan Obligations Plan Assets (Details) - USD ($)
$ in Millions
Feb. 26, 2021
Feb. 28, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 0.0 $ 0.0
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount $ 0.0 $ 0.0
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 100.00% 100.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 100.00% 100.00%
Defined Benefit Plan, Plan Assets, Amount $ 33.2 $ 31.3
Equity Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 70.00% 60.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 40.00% 40.00%
Debt Securities [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 25.00% 35.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 30.00% 30.00%
Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage 4.00% 4.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage 0.00% 0.00%
Defined Benefit Plan, Plan Assets, Amount $ 1.2 $ 1.1
All Other Plan Assets [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Actual Allocation, Percentage [1] 1.00% 1.00%
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage [1] 30.00% 30.00%
Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 0.2 $ 0.2
Equity Securities, International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 23.5 18.9
Fixed Income Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 8.3 11.1
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.2 0.2
Fair Value, Inputs, Level 1 [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.2 0.2
Fair Value, Inputs, Level 1 [Member] | Equity Securities, International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 1 [Member] | Fixed Income Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 33.0 31.1
Fair Value, Inputs, Level 2 [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 1.2 1.1
Fair Value, Inputs, Level 2 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 2 [Member] | Equity Securities, International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 23.5 18.9
Fair Value, Inputs, Level 2 [Member] | Fixed Income Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 8.3 11.1
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Real Estate [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Equity Securities, International [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount 0.0 0.0
Fair Value, Inputs, Level 3 [Member] | Fixed Income Funds [Member]    
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]    
Defined Benefit Plan, Plan Assets, Amount $ 0.0 $ 0.0
[1] epresents money market funds