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Real Estate (Impairments) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Real Estate [Abstract]
Impairment of assets held for use and sale carve-outs	$ 6.8	$ 5.0	$ 7.2	$ 29.1
Impairment of long-lived assets sale carve out	$ 0.5	$ 4.8	$ 0.9	$ 21.4

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- Definition

Impairment of Long-Lived Assets Held-for-use and Sale Carve Out

+ References

No definition available.

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Definition

Impairment of Long-Lived Assets Sale Carve Out

+ References

No definition available.

+ Details

Name:	sfi_ImpairmentofLongLivedAssetsSaleCarveOut
Namespace Prefix:	sfi_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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Namespace Prefix:	us-gaap_
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Period Type:	duration