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Agreements and Transactions with Related Parties - 2015 Activity (Details) - USD ($) $ in Millions	1 Months Ended		3 Months Ended		6 Months Ended		12 Months Ended
	Jul. 31, 2025	Apr. 30, 2025	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2015
Residential Mortgage Banking Business
Agreements and Transactions with Related Parties
Distribution received		$ 5.6
Agreement to sell business, expected sale price		22.0
Residential Mortgage Banking Business | Subsequent event
Agreements and Transactions with Related Parties
Distribution received	$ 16.4
Arbor Residential Investor LLC
Agreements and Transactions with Related Parties
Distribution received			$ 5.6	$ 7.7	$ 6.1	$ 7.7
Wakefield Investment Holding LLC | Residential Mortgage Banking Business
Agreements and Transactions with Related Parties
Agreement to sell business, expected sale price		117.3
Sale agreement, installment one		15.0
Sale agreement, installment two		15.0
Sale agreement, installment three		$ 87.3
Residential mortgage banking business | Other Related Party Transactions | Related Party
Agreements and Transactions with Related Parties
Gain (loss) on investment				(0.8)	(1.4)	0.8
Residential mortgage banking business | Other Related Party Transactions | Related Party | Noncontrolling Interest
Agreements and Transactions with Related Parties
Distribution received			$ 5.6	$ 7.7	$ 6.1	$ 7.7
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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