Reverse Mortgages - Schedule of Loans Held For Investment and HMBS Related Borrowings (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Receivables [Abstract]
Loans held for investment - reverse mortgages, beginning balance	$ 7,199.8	$ 6,997.1	$ 6,269.6
Cumulative effect of fair value election		0.0	47.0
Originations	1,658.1	1,763.4	1,203.6
Securitization of HECM loans accounted for as a financing	(1,780.4)	(1,674.9)	(1,232.6)
Additional proceeds from securitization of HECM loans and tails	(25.2)	(44.6)	(40.9)
HMBS related borrowings, acquisitions.	(209.1)
Repayments (principal payments received)	(1,579.9)	(1,626.4)	(944.7)
Loans held for sale, at fair value	(8.0)	(3.4)	(3.1)
Receivables, net	2.1	(0.3)	(0.2)
REO (Other assets)	(0.4)	(0.3)	(0.5)
Change in fair value	21.1	69.7	425.4
Securitized loans (pledged to HMBS-Related Borrowings)		6,979.1	6,872.2
Un-securitized loans		220.7	124.9
Loans held for investment, reverse mortgages, ending balance	7,504.1	7,199.8	6,997.1
HMBS Related Borrowings, Beginning Balance	(6,885.0)	(6,772.7)	(6,063.4)
Repayments (principal payments received)	1,568.4	1,614.3	935.8
Change in fair value	4.5	(7.1)	(371.5)
HMBS Related Borrowings, Ending Balance	(7,326.8)	(6,885.0)	$ (6,772.7)
Loans held for investment, reverse mortgages, acquisitions.	211.3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for sale ($617.8 and $917.5 carried at fair value) ($0.0 and $462.1 related to VIEs)	7,510.8	7,207.6
Loans held for sale ($617.8 and $917.5 carried at fair value) ($0.0 and $462.1 related to VIEs)	7,510.8	$ 7,207.6
Senior Lien
Receivables [Abstract]
Loans held for investment - securitized	7,392.6
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment - securitized	7,392.6
Loans held for sale ($617.8 and $917.5 carried at fair value) ($0.0 and $462.1 related to VIEs)	111.5
Loans held for sale ($617.8 and $917.5 carried at fair value) ($0.0 and $462.1 related to VIEs)	$ 111.5

HMBS related borrowings, acquisitions.

No definition available.

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- Definition

Amounts related to additional proceeds from securitization of loans and tails of home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

+ References

No definition available.

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- Definition

Change in fair value related to home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

+ References

No definition available.

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Principal repayment in connection with home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

+ References

No definition available.

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- Definition

Amounts related to securitization of home equity conversion mortgage-backed securities related borrowings accounted for as a financing.

+ References

No definition available.

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- Definition

This represents the amount of liability which is a resultant of reverse mortgage loans sold into the secondary with servicing rights retained. As the transfer of these loans do not meet the definition of participating interest because of the servicing requirement that requires the issuer to absorb some level of risk, these transfers are accounted for as financing.

+ References

No definition available.

+ Details

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- Definition

Loans held for investment, reverse mortgages.

+ References

No definition available.

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- Definition

Loans held for investment, reverse mortgages, acquisitions.

+ References

No definition available.

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- Definition

Amount recognized in conjunction with the adoption of ASU 2016-13 on future draw commitments on home equity conversion mortgage loans.

+ References

No definition available.

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- Definition

Change in fair value of loans held for investment, reverse mortgages during the period.

+ References

No definition available.

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- Definition

Amount of loans held for investment, reverse mortgages transferred to loans held for sale, fair value during the period.

+ References

No definition available.

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- Definition

Amount of loans held for investment, reverse mortgages originated during the period.

+ References

No definition available.

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- Definition

Amount of loans held for investment, reverse mortgages transferred to real estate owned during the period.

+ References

No definition available.

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- Definition

Amount of loans held for investment, reverse mortgages transferred to receivables during the period.

+ References

No definition available.

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- Definition

Principal payments received on loans held for investment during the period.

+ References

No definition available.

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- Definition

Amount of securitized loans held for investment, reverse mortgages.

+ References

No definition available.

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- Definition

Amount of un securitized loans held for investment, reverse mortgages.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-URI https://asc.fasb.org/subtopic&trid=2196772

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- Definition

This is the sum of principal amount outstanding for both securitized and unsecuritized loans of all types.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=121570589&loc=d3e107314-111719

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