Allowance for Credit Losses (Narratives) (Details) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Dec. 31, 2024	Mar. 31, 2024
Financing Receivable Impaired [Line Items]
Percentage of estimated gain loss	6.00%	5.00%
Paid and unpaid percentage	1.00%
Allowance for expected credit losses	$ 7.6	$ 6.2
Available for sale securities, accrued interest receivable	29.3	29.3
Premiums Receivable Gross	$ 4.1
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Premiums Receivable Gross		$ 0.1
Credit card receivables
Financing Receivable Impaired [Line Items]
Average Historical Chargeback Term	For credit card receivables, the Company uses a trailing 13-month average historical chargeback percentage of total credit card receivables to estimate a credit loss reserve. The Company rents equipment to corporate customers for which the payment terms are 30 days.
Accrued interest receivables
Financing Receivable Impaired [Line Items]
Average Historical Chargeback Term	Historical credit loss experience provides additional support for the estimation of expected credit losses. In assessing the credit losses, the portfolio is reviewed on a collective basis, using loan-specific cash flows to determine the fair value of the collateral in the event of default. Adjustments to this analysis are made to assess loans with a loan-to-value of 65% or greater.