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Share-Based Compensation - Equity Incentive Plans, RSU and PSU Activity (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2021
Weighted Average Grant Date Fair Value      
Share price (in dollars per share) $ 83.78    
Unvested share-based payment awards $ 327.2    
Restricted stock units' weighted average remaining expense recognition period (in years) 2 years 1 month 24 days    
Restricted Stock Units and Performance Stock Units      
Number of Shares      
Nonvested shares at beginning of period (in shares) 10,106,015 11,883,818 11,484,106
Granted (in shares) 3,226,654 2,995,991 4,678,494
Forfeited (in shares) (864,262) (978,325) (514,110)
Vested (in shares) (3,423,935) (3,795,469) (3,764,672)
Nonvested shares at end of period (in shares) 9,044,472 10,106,015 11,883,818
Weighted Average Grant Date Fair Value      
Nonvested shares at beginning of period (in dollars per share) $ 53.30 $ 44.77 $ 38.06
Granted (in dollars per share) 61.71 74.36 50.69
Forfeited (in dollars per share) 55.77 51.17 41.69
Vested (in dollars per share) 45.08 43.77 32.07
Nonvested shares at end of period (in dollars per share) $ 59.17 $ 53.30 $ 44.77
RSU Vested aggregate intrinsic value $ 256.3 $ 287.6 $ 218.5
Total intrinsic value of RSU's outstanding $ 757.7    
Performance Shares      
Number of Shares      
Granted (in shares) 172,334 145,188 140,160
Employee Stock Option      
Weighted Average Grant Date Fair Value      
Exercisable number of option shares (in shares) 21,016    
Weighted average exercise price per share of exercisable options (in dollars per share) $ 19.13