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Summary of Significant Accounting Policies Environmental Contingencies (Details) - USD ($) $ in Millions | Feb. 28, 2020 | Feb. 22, 2019
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Accounting Policies [Abstract] |  |
Accrual for Environmental Loss Contingencies, Discount Rate | 3.00% | 3.50%
Accrued Environmental Loss Contingencies, Current | $ 1.0 | $ 0.7
Accrued Environmental Loss Contingencies, Noncurrent | 1.9 | 2.4
Accrual for Environmental Loss Contingencies, Gross | $ 2.9 | $ 3.1

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118942415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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