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Allowance for Credit Losses (Narratives) (Details) - USD ($) $ in Millions	6 Months Ended
	Sep. 30, 2025	Mar. 31, 2025
Financing Receivable Impaired [Line Items]
Paid and unpaid percentage	1.00%
Available for sale securities, accrued interest receivable	$ 29.1	$ 29.4
Commercial Real Estate Portfolio Segment [Member]
Financing Receivable Impaired [Line Items]
Premiums Receivable Gross	$ 1.0	$ 0.1
Credit card receivables
Financing Receivable Impaired [Line Items]
Average Historical Chargeback Term	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.

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- Definition

Evaluation and assessment of customer credit worthiness over a specified time.

+ References

No definition available.

+ Details

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- Definition

Ratio of insurance contracts that are subject to reinsurance participation to all contracts in force.

+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Carrying amount as of the balance sheet date of noncurrent interest earned but not received. Also called accrued interest or accrued interest receivable.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(17))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1

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- Definition

Gross amount, as of the balance sheet date, due the entity from (a) agents and insureds, (b) uncollected premiums and (c) others, before deducting the allowance for doubtful accounts.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 944
-SubTopic 210
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(5))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478777/944-210-S99-1

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