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Fair Value Hierarchy of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Millions | Nov. 23, 2018 | Feb. 23, 2018 | Nov. 24, 2017 | Feb. 24, 2017
--- | --- | --- | --- | ---
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Cash and cash equivalents | $ 51.0 | $ 283.1 |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure | 51.0 | 283.1 |  |
Restricted Cash |  | 2.5 | $ 2.5 | $ 2.5
Restricted Cash and Cash Equivalents | 3.4 | 2.5 |  |
Assets, Fair Value Disclosure | 61.2 | 291.2 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (1.0) | (1.4) |  |
Liabilities, Fair Value Disclosure | (1.0) | (1.4) |  |
Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 3.2 | 2.1 |  |
Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | 3.6 | 3.5 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Cash and Cash Equivalents, Fair Value Disclosure |  | 283.1 |  |
Restricted Cash | 3.4 |  |  |
Restricted Cash and Cash Equivalents |  | 2.5 |  |
Assets, Fair Value Disclosure | 54.4 | 285.6 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Measurements, 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, Measurements, 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, Measurements, 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 and Cash Equivalents | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure | 3.2 | 2.1 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | (1.0) | (1.4) |  |
Liabilities, Fair Value Disclosure | (1.0) | (1.4) |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Contract [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Foreign Currency Contract, Asset, Fair Value Disclosure | 3.2 | 2.1 |  |
Fair Value, Measurements, 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, Measurements, 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 and Cash Equivalents | 0.0 | 0.0 |  |
Assets, Fair Value Disclosure | 3.6 | 3.5 |  |
Liabilities, Fair Value Disclosure [Abstract] |  |  |  |
Foreign exchange forward contracts, Liability, Fair Value Disclosure | 0.0 | 0.0 |  |
Liabilities, Fair Value Disclosure | 0.0 | 0.0 |  |
Fair Value, Measurements, 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, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Auction Rate Securities [Member] |  |  |  |
Assets, Fair Value Disclosure [Abstract] |  |  |  |
Available-for-sale Securities, Fair Value Disclosure | $ 3.6 | $ 3.5 |  |

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