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Capital Stock - Schedule of Stock Option and SARs (Details) - Stock Options and SARs
shares in Millions
 3 Months Ended
Jun. 30, 2026
$ / shares
shares
Number of Shares  
Outstanding, beginning balance (in shares) | shares 16.9
Granted (in shares) | shares 4.5
Options exercised (in shares) | shares (0.5)
Forfeited or expired (in shares) | shares 0.1
Outstanding, ending balance (in shares) | shares 20.9
Weighted Average Exercise Price (per share)  
Outstanding, beginning balance, weighted average exercise price (in usd per share) | $ / shares $ 14.67
Granted, weighted average exercise price (in usd per share) | $ / shares 11.07
Options exercised, weighted average exercise price (in usd per share) | $ / shares 10.20
Forfeited or expired, weighted average exercise price (in usd per share) | $ / shares 14.88
Outstanding, Ending balance, weighted average exercise price (in usd per share) | $ / shares $ 14.01
Number of shares, vested or expected to vest (in shares) | shares 20.8
Weighted average exercise price, vested or expected to vest (in dollars per share) | $ / shares $ 14.01
Number of shares exercisable, (in shares) | shares 16.2
Weighted average exercise price (in dollars per share) | $ / shares $ 14.85