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Borrowings - Schedule of Aggregate Long-term Borrowings (Details)
$ in Millions
Dec. 31, 2023
USD ($)
Debt Instrument [Line Items]  
2022 $ 1,036.5
2023 918.1
2024 525.2
2025 285.0
2026 28.1
Thereafter 0.0
Long-term debt, gross 2,792.9
Fair value 2,674.1
Match Funded Liabilities  
Debt Instrument [Line Items]  
2022 0.0
2023 498.9
2024 0.9
2025 0.0
2026 0.0
Thereafter 0.0
Long-term debt, gross 499.7
Fair value 499.7
Mortgage Loan Warehouse Facilities  
Debt Instrument [Line Items]  
2022 567.2
2023 0.0
2024 164.4
2025 0.0
2026 0.0
Thereafter 0.0
Long-term debt, gross 731.6
Fair value 717.6
MSR Financing Facilities  
Debt Instrument [Line Items]  
2022 469.3
2023 419.2
2024 0.0
2025 0.0
2026 28.1
Thereafter 0.0
Long-term debt, gross 916.6
Fair value 900.3
Senior Notes  
Debt Instrument [Line Items]  
2022 0.0
2023 0.0
2024 360.0
2025 285.0
2026 0.0
Thereafter 0.0
Long-term debt, gross 645.0
Fair value $ 556.5