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Share-Based Compensation Stock Option Valuation Assumptions (Details) - Stock Options - USD ($)
3 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected dividends $ 0 $ 0
Risk-free rate 1.30%  
Granted, weighted-average grant-date fair value (in USD per share) $ 14.77 $ 12.91
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 31.20% 32.10%
Expected term in years 6 years 6 years
Risk-free rate   0.50%
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 31.90% 32.20%
Expected term in years 7 years 7 years