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Real Estate (Real Estate Available and Held for Sale) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value	$ 8.9	$ 200.4	$ 31.3
Operating Properties
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value	0.0	14.5	23.2
Net Lease
Real Estate Properties [Line Items]
Property transferred to held for sale, aggregate, carrying value	$ 8.9	$ 185.9	$ 8.1

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- Definition

Property Transferred to Held for Sale, Aggregate, Carrying Value

+ References

No definition available.

+ Details

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Namespace Prefix:	star_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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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.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

Name:	us-gaap_RealEstatePropertiesAxis=star_OperatingPropertiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RealEstatePropertiesAxis=star_NetLeaseAssetMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: