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Agreements and Transactions with Related Parties - 2015 Activity (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024	Dec. 31, 2015
Agreements and Transactions with Related Parties
Indirect ownership percentage	12.30%		12.30%
Residential mortgage banking business | Other Related Party Transactions | Related Party
Agreements and Transactions with Related Parties
Gain (loss) on investment	$ (1.4)	$ 1.6
Residential mortgage banking business | Other Related Party Transactions | Related Party | Noncontrolling Interest
Agreements and Transactions with Related Parties
Indirect ownership percentage	12.30%
Distribution received	$ 0.5
Residential mortgage banking business | Other Related Party Transactions | Related Party | ACM
Agreements and Transactions with Related Parties
Noncontrolling interest in equity method investment acquired (as a percent)				50.00%
ACM | Residential mortgage banking business | Other Related Party Transactions | Related Party
Agreements and Transactions with Related Parties
Acquisition purchase price				$ 9.6

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Amount of realized and unrealized gain (loss) on investment.

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