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Derivatives - Additional Information (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
Sep. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
derivative_instrument
Derivative [Line Items]          
Hedging ineffectiveness recorded in earnings $ 0 $ 0 $ 0 $ 0  
Estimated gain reclassified from other comprehensive income (loss) to earnings as contracts settle     500,000    
Interest Rate Swap [Member]          
Derivative [Line Items]          
Hedging ineffectiveness recorded in earnings 0   0    
Estimated gain reclassified from other comprehensive income (loss) to earnings as contracts settle     (7,000,000)    
Designated [Member]          
Derivative [Line Items]          
Derivative liability notional amount         $ 750,000,000
Designated [Member] | Interest Rate Swap [Member]          
Derivative [Line Items]          
Number of interest rate swaps | derivative_instrument         8
Derivative notional amount $ 750,000,000   $ 750,000,000