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Commitments, Guarantees, And Contingencies (Narrative) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Loss Contingencies [Line Items]
Outstanding committed capital to certain entities	$ 2.2
TBA [Member]
Loss Contingencies [Line Items]
Fair value of the TBA securities	231.9
Purchase Commitments [Member] | TBA [Member]
Loss Contingencies [Line Items]
Estimated fair value of the purchase commitments	$ 231.9

X

- Definition

Outstanding committed capital to certain entities.

+ References

No definition available.

+ Details

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Namespace Prefix:	sf_
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Balance Type:	credit
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X

- Definition

Fair value portion of arrangements with third parties, including, but not limited to, operating lease arrangement and arrangement in which the entity has agreed to expend funds to procure goods or services, or has agreed to commit resources to supply goods or services.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(25))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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 of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as available-for-sale.

+ References

No definition available.

+ Details

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- Details

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- Details

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