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Debt - Senior Secured Facilities Agreement - Revolving Credit Facility (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Debt Instrument [Line Items]        
Commitment fee percentage 0.175%      
Interest rate index period, in days   90 days    
Effective percentage rate   6.21% 6.21% 6.21%
Not Designated as Hedging Instrument | Interest rate swaps        
Debt Instrument [Line Items]        
Derivative, Notional Amount, Net of Current Expirations   $ 130    
Percentage of JV variable debt hedged by long-term interest rate derivatives   81.00%    
New Zealand JV        
Debt Instrument [Line Items]        
Basis spread on variable rate, percentage   0.80%    
Line of Credit Facility, Credit Line Fee   0.80%    
Effective percentage rate   6.30%    
Tranche A, Revolving Cash Advance Facility | Not Designated as Hedging Instrument | Interest rate swaps        
Debt Instrument [Line Items]        
Percentage of JV variable debt hedged by long-term interest rate derivatives   81.00%    
Tranche A, Revolving Cash Advance Facility | New Zealand JV        
Debt Instrument [Line Items]        
Amount outstanding   $ 161    
Interest rate during period   3.54%    
Commitment fee percentage   80.00%