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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Earnings Per Share        
Net Income (Loss) $ 44.4 $ 46.1 $ 95.6 $ 93.4
Weighted-average shares outstanding - basic (in shares) 52.7 52.6 52.7 52.5
Effect of dilutive securities (in shares) 1.1 1.3 1.0 1.4
Weighted-average shares outstanding - diluted (in shares) 53.8 53.9 53.7 53.9
Earnings per Share [Abstract]        
Net earnings per share - basic (in dollars per share) $ 0.84 $ 0.88 $ 1.81 $ 1.78
Net earnings per share - diluted (in dollars per share) $ 0.83 $ 0.86 $ 1.78 $ 1.73
Anti-dilutive, Securities 0.0 0.0 0.0 0.0