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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