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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Feb. 26, 2021 | Feb. 28, 2020 | Feb. 22, 2019 | Feb. 23, 2018
--- | --- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Restricted Cash |  | $ 6.1 | $ 3.5 | $ 2.5
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 1.1 | 1.2 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.8) | (0.5) |  |
Fair Value, Recurring [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 489.8 | 541.0 |  |
Restricted Cash | 5.8 | 6.1 |  |
Assets, Fair Value Disclosure | 499.3 | 550.4 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.8) | (0.5) |  |
Liabilities, Fair Value Disclosure | 0.8 | 0.5 |  |
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1.1 | 1.2 |  |
Fair Value, Recurring [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 2.6 | 2.1 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 489.8 | 541.0 |  |
Restricted Cash | 5.8 | 6.1 |  |
Assets, Fair Value Disclosure | 495.6 | 547.1 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Restricted Cash | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure | 1.1 | 1.2 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.8) | (0.5) |  |
Liabilities, Fair Value Disclosure | 0.8 | 0.5 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1.1 | 1.2 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 0.0 | 0.0 |  |
Restricted Cash | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure | 2.6 | 2.1 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 2.6 | $ 2.1 | $ 3.9 |

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