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v2.4.1.9

Risk Management and Derivatives (Credit Risk-Related Contingent Features) (Details) (Forward Contracts, USD $) In Millions, unless otherwise specified | Dec. 31, 2014 | Dec. 31, 2013
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Forward Contracts |  |
Derivative [Line Items] |  |
Collateral Posted For Hedges | $ 3.0star_CollateralPostedForHedges / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember | $ 7.2star_CollateralPostedForHedges / us-gaap_DerivativeByNatureAxis = us-gaap_ForwardContractsMember

X
- Definition Collateral Posted For Hedges + References No definition available. + Details
Name: | star_CollateralPostedForHedges
Namespace Prefix: | star_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_DerivativeLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration