Borrowings - Schedule of Aggregate Long-term Borrowings (Details) $ in Millions	Dec. 31, 2022 USD ($)
Debt Instrument [Line Items]
2022	$ 1,700.5
2023	13.8
2024	422.2
2025	376.2
2026	285.0
Thereafter	33.4
Long-term debt, gross	2,831.0
Fair value	2,703.7
Match Funded Liabilities
Debt Instrument [Line Items]
2022	512.5
2023	0.0
2024	0.0
2025	1.2
2026	0.0
Thereafter	0.0
Long-term debt, gross	513.7
Fair value	513.7
Mortgage Loan Warehouse Facilities
Debt Instrument [Line Items]
2022	702.7
2023	0.0
2024	0.0
2025	0.0
2026	0.0
Thereafter	0.0
Long-term debt, gross	702.7
Fair value	702.7
MSR Financing Facilities
Debt Instrument [Line Items]
2022	485.2
2023	13.8
2024	422.2
2025	0.0
2026	0.0
Thereafter	33.4
Long-term debt, gross	954.6
Fair value	932.1
Senior Notes
Debt Instrument [Line Items]
2022	0.0
2023	0.0
2024	0.0
2025	375.0
2026	285.0
Thereafter	0.0
Long-term debt, gross	660.0
Fair value	$ 555.2

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