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SUMMARY OF ACCOUNTING POLICIES - Property and Equipment, Net (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2019
Property, Plant and Equipment      
Property and equipment, gross $ 5,843.0 $ 5,736.0  
Accumulated depreciation and amortization (3,746.0) (3,520.0)  
Property and equipment, net 2,097.0 2,216.0  
Depreciation 422.3 422.4 $ 433.4
Machinery and equipment      
Property, Plant and Equipment      
Property and equipment, gross $ 3,381.0 3,265.0  
Machinery and equipment | Minimum      
Property, Plant and Equipment      
Depreciable Life (In Years) 2 years    
Machinery and equipment | Maximum      
Property, Plant and Equipment      
Depreciable Life (In Years) 10 years    
Buildings      
Property, Plant and Equipment      
Property and equipment, gross $ 1,103.0 1,086.0  
Depreciable Life (In Years) 30 years    
Leasehold improvements      
Property, Plant and Equipment      
Property and equipment, gross $ 500.0 510.0  
Leasehold improvements | Maximum      
Property, Plant and Equipment      
Depreciable Life (In Years) 30 years    
Furniture, fixtures, computer equipment and software      
Property, Plant and Equipment      
Property and equipment, gross $ 491.0 492.0  
Furniture, fixtures, computer equipment and software | Minimum      
Property, Plant and Equipment      
Depreciable Life (In Years) 3 years    
Furniture, fixtures, computer equipment and software | Maximum      
Property, Plant and Equipment      
Depreciable Life (In Years) 7 years    
Land      
Property, Plant and Equipment      
Property and equipment, gross $ 113.0 112.0  
Construction-in-progress      
Property, Plant and Equipment      
Property and equipment, gross $ 255.0 $ 271.0