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Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Receivable	$ 22.5		$ 22.5
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount	16,500.0		15,400.0
Loan loss accrual	26.3		24.6
Loan loss guarantee reserve	20.0		22.9
Loss Contingency Accrual [Roll Forward]
Loss Contingency, Receivable	22.5		22.5
Loan loss guarantee reserve	20.0		$ 22.9
Insurance Claims [Member]
Loss Contingency Accrual [Roll Forward]
Loss Contingency Accrual	1.2	$ 48.2
Loss Contingency Accrual, Provision	0.0	1.3
Loss Contingency Accrual, Provision Adjustment	(0.1)	(30.7)
Loss Contingency Accrual, Payments	0.0	(11.9)
Loss Contingency Accrual	$ 1.1	$ 6.9

X

- Definition

Loan loss accrual

+ References

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- Definition

contingent reserve for loss sharing program

+ References

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- Definition

Loan subject to loss-sharing arrangements, aggregate unpaid principal amount

+ References

No definition available.

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- Definition

Loss Contingency Accrual, Provision Adjustment

+ References

No definition available.

+ Details

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- References

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- Definition

Amount of loss contingency liability.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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- Definition

Amount of cash outflow reducing loss contingency liability.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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- Definition

Amount charged against operating income increasing loss contingency liability, after adjustments to reduce previously estimated charges.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
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- Definition

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- Definition

Amount of receivable related to a loss contingency accrual. For example, an insurance recovery receivable.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
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