Allowance for Credit Losses (Narratives) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($) Segment	Mar. 31, 2024 USD ($)
Financing Receivable Impaired [Line Items]
Trade receivable components | Segment	2
Percentage of estimated gain loss	5.00%
Paid and unpaid percentage	1.00%
Allowance for expected credit losses	$ 8.3	$ 6.2
Available for sale securities, accrued interest receivable	30.4	29.3
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Premiums Receivable Gross	$ 1.1	$ 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 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.