v3.26.1
Common Shares (Tables)
 12 Months Ended
Mar. 31, 2026
Notes To Financial Statements [Abstract]  
Schedule of Weighted Average Number of Shares [Table Text Block]
(shares in millions)
Years ended March 31,202620252024
Denominator:
Weighted average shares outstanding—basic98.2 98.6 98.8 
Dilutive effect of share equivalents0.4 0.5 0.6 
Weighted average shares outstanding and share equivalents—diluted98.7 99.1 99.4 
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]
Options to purchase the following number of shares were outstanding but excluded from the computation of diluted earnings per share because the combined exercise prices, unamortized fair values, and assumed tax benefits upon exercise were greater than the average market price for the shares during the periods, so including these options would be anti-dilutive:
(shares in millions)
Years ended March 31,202620252024
Number of ordinary share options0.6 0.7 0.6