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Commitments and Contingencies (Details) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Receivable	$ 2.5		$ 44.0
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount	13,200.0		12,200.0
Loan loss accrual	23.6		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	1.3	0.7
Loss Contingency Accrual, Provision Adjustment	(30.7)	(0.7)
Loss Contingency Accrual, Payments	(11.9)	0.0
Loss Contingency Accrual	$ 6.9	$ 38.1

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- Definition

Loan loss accrual

+ References

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- Definition

contingent reserve for loss sharing program

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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

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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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-Topic 450
-SubTopic 20
-Section 50
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Topic 460
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