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Agreements and Transactions with Related Parties - 2015 Activity (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023	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 | Noncontrolling Interest
Agreements and Transactions with Related Parties
Indirect ownership percentage			12.30%
Gain (loss) on investment	$ (1.0)	$ (1.3)	$ (0.1)	$ 1.3
Distribution received		$ 7.5	$ 7.7	$ 15.0
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 distribution received from equity method investee for return on investment, classified as operating activities. Excludes distribution for return of investment, classified as investing activities.

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

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