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Stock-Based Compensation Plans - Restricted Share Unit Activity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Unrecognized compensation cost	$ 7.0		$ 7.0
Weighted average life over which unrecognized compensation is expected to be recognized			1 year 4 months 17 days
General and Administrative Expenses
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Stock-based compensation expense	$ 1.7	$ 1.4	$ 9.0	$ 6.3
Restricted Stock Units
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Fair value of restricted share vested during the period			$ 12.3
Incentive Share/Unit Awards
Unvested as of April 1st			307,873
Granted			296,110
Vested			(330,987)
Unvested as of December 31st	272,996		272,996
Weighted-Average Grant-Date Fair Value
Unvested as of April 1st			$ 23.16
Granted			37.16
Vested			27.37
Unvested as of December 31st	$ 36.06		$ 36.06