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Commitments and Contingencies (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Receivable	$ 22.5		$ 44.0
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount	14,700.0		12,200.0
Loan loss accrual	24.1		22.1
Loan loss guarantee reserve	22.9		$ 36.7
Insurance Claims [Member]
Loss Contingency Accrual [Roll Forward]
Loss Contingency Accrual	48.2	$ 38.1
Loss Contingency Accrual, Provision	1.5	5.8
Loss Contingency Accrual, Provision Adjustment	(10.8)	0.8
Loss Contingency Accrual, Payments	(13.1)	0.0
Loss Contingency Accrual	$ 25.8	$ 44.7

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- Definition

Loan loss accrual

+ References

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- Definition

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- Definition

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

+ References

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- Definition

Loss Contingency Accrual, Provision Adjustment

+ 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
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- Definition

Amount of cash outflow reducing loss contingency liability.

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-SubTopic 20
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- Definition

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

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

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