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Description of Business, Basis of Presentation and Significant Accounting Policies (Other) (Details) - USD ($)
$ in Millions
12 Months Ended
Apr. 01, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2017
Apr. 01, 2018
Apr. 01, 2017
Mar. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment for new accounting pronouncement         $ 18.7 $ 60.8  
Decrease in cash provided by operating activities   $ 427.5 $ 386.4 $ 558.5      
Increase in beginning cash and cash equivalents to include restricted cash   184.3 378.1 324.7     $ 60.6
Restricted cash   0.0 0.0        
Advertising expenses   $ 640.1 654.9 588.8      
Timing of payment   60 days          
Revenue from Contracts with Customers (Topic 606)              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment for new accounting pronouncement         18.7    
Liability for sales returns and certain sales incentive allowances         86.9    
Restricted Cash              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Decrease in cash provided by operating activities     $ 2.8 0.1      
Increase in beginning cash and cash equivalents to include restricted cash       $ 2.8     $ 2.9
Retained Earnings              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment for new accounting pronouncement         21.3 $ 60.8  
Retained Earnings | Recognition and Measurement of Financial Instruments              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Cumulative effect adjustment for new accounting pronouncement         $ 2.6    
Minimum | Pro Forma | Accounting for Leases              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Quantification of new accounting pronouncements $ 180.0            
Maximum | Pro Forma | Accounting for Leases              
New Accounting Pronouncements or Change in Accounting Principle [Line Items]              
Quantification of new accounting pronouncements $ 200.0