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Equity (Dividends) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dividends [Abstract]    
Minimum percentage of taxable income (excluding net capital gains) to be distributed in order to qualify as REIT 90.00%star_MinimumPercentageOfTaxableIncomeExcludingCapitalGainsToBeDistributedToQualifyAsReit  
Percentage of taxable income (including net capital gains) to be distributed in order to qualify as REIT 100.00%star_PercentageOfTaxableIncomeIncludingCapitalGainsToBeDistributedToQualifyAsReit  
Operating loss carryforwards   $ 759.8us-gaap_OperatingLossCarryforwards