v3.26.1
Organization and Significant Accounting Policies - Schedule of Basic and Dilutive Common Shares Outstanding Used in Determining Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Accounting Policies [Abstract]      
Net income $ 104.0 $ 424.0 $ 510.2
Basic common shares outstanding (in shares) 541.8 430.8 438.4
Dilutive effect of stock awards (in shares) 3.7 1.3 1.2
Diluted common shares outstanding (in shares) 545.5 432.1 439.6
Net income per share of common stock:      
Basic (in dollars per share) $ 0.19 $ 0.98 $ 1.16
Diluted (in dollars per share) $ 0.19 $ 0.98 $ 1.16