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PS FUND 1 INVESTMENT (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Apr. 30, 2014
Schedule of Equity Method Investments [Line Items]          
Proceeds from sale of equity method investment   $ 0.0 $ 75.9 $ 0.0  
Return on investment     $ 398.0    
PS Fund 1, LLC          
Schedule of Equity Method Investments [Line Items]          
Equity method investment         $ 76.0
Exchange of common stock, number of shares allocable 597,431 597,431      
Common stock held for PS Fund 1   28,878,538      
Total proceeds from sale of the shares $ 473.0        
Proceeds from shares allocable to investor 127.0        
Proceeds from percentage of net profits owned by investor $ 346.0        
Ownership percentage of net profits 15.00%   15.00%    
Net gain on sale of shares $ 287.0        
Commitment letter fees 54.0        
Aggregate amount of expenses $ 110.0