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Stock-based Compensation - Equity Incentive Plan (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchase of common stock [1] $ 804.0 $ 418.0 $ 225.0
Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Repurchase of common stock (in shares) 5,600,000 3,200,000 2,100,000
Repurchase of common stock $ 764.0 $ 373.0 $ 196.0
Amended and Restated Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options outstanding, unvested (in shares) 100,000 200,000  
Outstanding, weighted average grant date fair value (in dollars per share) $ 20.60 $ 18.45  
Stock options outstanding (in shares) 700,000 800,000  
Outstanding, weighted average exercise price (in dollars per share) $ 69.88 $ 67.98  
Restricted stock granted (in shares) 684,649    
Repurchase of common stock (in shares) 300,000    
Repurchase of common stock $ 33.4    
Employee Stock Option | Amended and Restated Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Options available for future grant (in shares) 5,100,000 6,000,000.0  
Stock option expiration period 10 years    
Stock option vesting period 5 years    
Restricted Stock | Amended and Restated Equity Incentive Plan | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Aggregate fair value of all awards issued $ 81.0 $ 86.0  
Restricted Stock | Amended and Restated Equity Incentive Plan | Director | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 1 year    
Restricted Stock | Annual Incentive Plan | Officer | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 3 years    
Stock issued upon conversion (in shares) 1    
Restricted Stock | Annual Incentive Plan | Director | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 3 years    
Restricted Stock Units (RSUs) | Amended and Restated Equity Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock option vesting period 3 years    
Restricted Stock Units (RSUs) | Amended and Restated Equity Incentive Plan | Class A Common Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Restricted stock granted (in shares) 700,000    
Aggregate fair value of all awards issued $ 104.0    
[1] During fiscal 2025, 2024, and 2023, the Company purchased 5.6 million, 3.2 million and 2.1 million shares, respectively, of the Company’s Class A Common Stock for $764 million, $373 million, and $196 million, respectively. Additionally, during fiscal 2025, 2024, and 2023, the Company repurchased shares for $40 million, $45 million and $29 million, respectively, to cover the minimum statutory taxes on repurchases and restricted stock units that vested on various dates during those years.