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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Feb. 28, 2020 | Feb. 22, 2019 | Feb. 23, 2018 | Feb. 24, 2017
--- | --- | --- | --- | ---
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Restricted Cash |  | $ 3.5 | $ 2.5 | $ 2.5
Foreign Currency Contract, Asset, Fair Value Disclosure | $ 1.2 | 3.9 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.5) | (0.5) |  |
Fair Value, Recurring [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 541.0 | 261.3 |  |
Restricted Cash | 6.1 | 3.5 |  |
Assets, Fair Value Disclosure | 550.4 | 272.6 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.5) | (0.5) |  |
Liabilities, Fair Value Disclosure | 0.5 | 0.5 |  |
Fair Value, Recurring [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 1.2 | 3.9 |  |
Fair Value, Recurring [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 2.1 | 3.9 |  |
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 541.0 | 261.3 |  |
Restricted Cash | 6.1 | 3.5 |  |
Assets, Fair Value Disclosure | 547.1 | 264.8 |  |
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 | 1.2 | 3.9 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contracts, Liability, Fair Value Disclosure | (0.5) | (0.5) |  |
Liabilities, Fair Value Disclosure | 0.5 | 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 | 1.2 | 3.9 |  |
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 | 2.1 | 3.9 |  |
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 | $ 2.1 | $ 3.9 | $ 3.5 |

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