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Commitments and Contingencies (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]
Loss Contingency, Receivable	$ 14.5		$ 44.0
Loan subject to loss-sharing arrangements, aggregate unpaid principal amount	12,900.0		12,200.0
Loan loss accrual	23.5		$ 22.1
Insurance Claims [Member]
Loss Contingency Accrual [Roll Forward]
Loss Contingency Accrual	48.2	$ 38.1
Loss Contingency Accrual, Provision	0.0	0.3
Loss Contingency Accrual, Provision Adjustment	(30.2)	(4.8)
Loss Contingency Accrual, Payments	(0.4)	0.0
Loss Contingency Accrual	$ 17.6	$ 33.6

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- Definition

Loan loss accrual

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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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-Publisher FASB
-Name Accounting Standards Codification
-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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
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