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Description of Business, Basis of Presentation and Significant Accounting Policies (Other) (Details)
$ in Millions
 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Sep. 30, 2019
Apr. 01, 2019
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Lease, Liability $ 164.9        
Operating Lease, Right-of-Use Asset 136.9        
Goodwill 2,833.5 $ 2,833.5 $ 2,740.8    
Indefinite-lived Intangible Assets (Excluding Goodwill) 250.0        
Advertising expenses $ 782.4 $ 640.1 $ 654.9    
Timing of payment 60 days        
Accounting for Leases          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Operating Lease, Liability         $ 187.2
Operating Lease, Right-of-Use Asset         157.4
Incentive to Lessee         $ 29.8
Minimum | Perpetual Nominal Growth Rate          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Goodwill measurement input 0.015     0.015  
Minimum | Discount Rate          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Goodwill measurement input 0.115     0.10  
Maximum | Perpetual Nominal Growth Rate          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Goodwill measurement input 0.040     0.040  
Maximum | Discount Rate          
New Accounting Pronouncements or Change in Accounting Principle [Line Items]          
Goodwill measurement input 0.15     0.14