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Income Taxes - Income Tax Contingency (Details) - USD ($)
$ in Millions
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
Liability For Uncertain Tax Positions [Abstract]            
Tax $ 165.0 $ 219.0 $ 219.0 $ 253.0 $ 165.0 $ 219.0
Interest       45.0 41.0 40.0
Penalties       21.0 25.0 25.0
Offset to receivable       (24.0) 0.0  
Net of tax attributes       (12.0) (15.0)  
Total       283.0 216.0  
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]            
Balance at beginning of fiscal year 165.0 219.0 192.0      
Gross increases related to prior year tax positions 74.0 4.0 10.0      
Gross decreases related to prior year tax positions (9.0) (27.0) (12.0)      
Gross increases related to current year tax positions 15.0 0.0 7.0      
Settlements and statute of limitation expirations (7.0) (23.0) (19.0)      
Acquisitions 18.0 0.0 39.0      
Foreign exchange and others (3.0) (8.0) 2.0      
Balance at end of fiscal year 253.0 165.0 219.0      
Liability for uncertain tax positions that if recognized would affect the effective tax rate       210.0 138.0 170.0
Interest Accrued Related to Uncertain Tax Positions and Penalties [Abstract]            
Interest 5.0 2.0 2.0      
Interest, net of tax 3.0 1.0 2.0      
Accrued penalties $ (3.0) $ (1.0) $ 0.0      
Liability for interest       45.0 41.0 40.0
Liability for interest, net of tax       40.0 36.0 36.0
Liability for penalties       21.0 $ 25.0 $ 25.0
Minimum | Settlement with Taxing Authority            
Interest Accrued Related to Uncertain Tax Positions and Penalties [Abstract]            
Reasonably possible reduction in liability for uncertain tax positions in next twelve months       25.0    
Maximum | Settlement with Taxing Authority            
Interest Accrued Related to Uncertain Tax Positions and Penalties [Abstract]            
Reasonably possible reduction in liability for uncertain tax positions in next twelve months       $ 27.0