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Debt (Details) - USD ($)
1 Months Ended 9 Months Ended
May 31, 2016
Sep. 30, 2016
Sep. 30, 2015
Jun. 30, 2016
Apr. 30, 2016
Financial Instruments          
Amortization of debt issuance costs   $ 44,823,000 $ 2,611,000    
Designated as Hedging Instrument [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]          
Financial Instruments          
Notional amount of interest rate locks       $ 3,600,000,000  
Interest rate lock liability, pretax loss recognized in cumulative other comprehensive loss   157,300,000      
Designated as Hedging Instrument [Member] | Other Current Liabilities [Member] | Interest Rate Contract [Member] | Cash Flow Hedging [Member]          
Financial Instruments          
Interest rate lock liability [1]   157,300,000      
Line of Credit [Member] | Other Current Assets [Member]          
Financial Instruments          
Debt issuance costs   65,100,000      
Line of Credit [Member] | Interest Expense [Member]          
Financial Instruments          
Amortization of debt issuance costs   42,800,000      
Periodic fees   7,100,000      
Bridge Loan [Member] | Line of Credit [Member] | Bridge Credit Agreement [Member]          
Financial Instruments          
Maximum borrowing capacity         $ 7,300,000,000
Borrowings outstanding   0      
Publicly Traded Debt [Member] | Carrying Amount [Member]          
Financial Instruments          
Fair Value   1,907,189,000 1,905,438,000    
Publicly Traded Debt [Member] | Fair Value [Member]          
Financial Instruments          
Fair Value   2,003,093,000 1,958,636,000    
Non-traded debt [Member] | Carrying Amount [Member]          
Financial Instruments          
Fair Value   4,203,000 4,851,000    
Non-traded debt [Member] | Fair Value [Member]          
Financial Instruments          
Fair Value   3,963,000 $ 4,620,000    
Line of Credit [Member] | Term Credit Agreement [Member]          
Financial Instruments          
Maximum borrowing capacity         $ 2,000,000,000
Borrowings outstanding   0      
Line of Credit [Member] | May 2016, Five Year Credit Agreement [Member]          
Financial Instruments          
Maximum borrowing capacity $ 200,000,000        
Borrowings outstanding   $ 0      
Term (in years) 5 years        
[1] The interest rate lock liability is measured at the present value of the expected future cash flows using market-based observable inputs. See Note 15.