Employee Benefit Plan Obligations Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Feb. 25, 2022	Feb. 26, 2021	Feb. 28, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Deferred Compensation Arrangement with Individual, Compensation Expense	$ 2.0	$ 7.7	$ 3.3
Defined Benefit Plan, Health Care Cost Trend Rate Assumed, Next Fiscal Year	5.83%	5.84%
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate	4.50%	4.50%
Defined Contribution Plan, Cost	$ 17.1	$ 19.3	37.5
Defined Benefit Plan, Plan Assets, Amount	35.2	33.2
Defined Benefit Plan, Assets for Plan Benefits	$ 3.5	0.0
Defined Benefit Plan, Expected Future Employer Contributions, Next Fiscal Year, Description	18.4
Other Postretirement Benefit Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	$ 4.3	3.5
Defined Benefit Plan, Plan Assets, Amount	0.0	0.0	0.0
Defined Benefit Plan, Benefit Obligation	34.1	42.7	44.3
Defined Benefit Plan, Assets for Plan Benefits	0.0	0.0
Pension Plans, Defined Benefit [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Defined Benefit Plan, Plan Assets, Contributions by Employer	4.7	4.1
Defined Benefit Plan, Plan Assets, Amount	35.2	33.2	31.3
Defined Benefit Plan, Benefit Obligation	73.7	85.9	$ 82.5
Defined Benefit Plan, Assets for Plan Benefits	$ 3.5	$ 0.0