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Borrowings under Repurchase Agreements (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025 USD ($) counterparties	Dec. 31, 2024 USD ($) counterparties	Dec. 31, 2023 USD ($) counterparties
Repurchase Agreements [Line Items]
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$ 567.0	$ 611.3	$ 791.5
Number of Counterparties with Outstanding Repurchase Agreements | counterparties	13	14	19
Pledged Assets, Unsettled	$ 4.6	$ 10.5	$ 51.0
Securities Received as Collateral		$ (3.1)	0.8
Repurchase Agreement Counterparty Concentration Risk Threshold	10.00%	10.00%
Cash collateral posted (received) under repurchase agreements	$ 0.1	$ (4.2)	$ 11.2
Minimum
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	30 days
Maximum
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	364 days

X

- Definition

Cash collateral posted (received) under repurchase agreements

+ References

No definition available.

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- Definition

Number of counterparties with outstanding repurchase agreements at period end.

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- Definition

The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements which have been sold prior to period end but remain unsettled at the balance sheet date.

+ References

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- Definition

Repurchase Agreement Counterparty Concentration Risk Threshold

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- Definition

[Line Items] for Repurchase Agreements [Table]

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- Definition

Repurchase Agreements Maturity

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- Definition

The carrying value as of the balance sheet date of the assets received as collateral against securities loaned to other broker-dealers. Borrowers of securities generally are required to provide collateral to the lenders of securities, commonly cash but sometimes other securities or standby letters of credit, with a value slightly higher than that of the securities borrowed. In instances where the entity is permitted to sell or re-pledge these securities, the entity reports the fair value of the collateral received and the related obligation to return the collateral as a liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
-Subparagraph (b)(1)
-SubTopic 30
-Topic 860
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481420/860-30-50-1A

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- Definition

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147483444/210-20-55-12

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