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Senior Unsecured Notes and Secured Debt - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 02, 2020
Jul. 01, 2020
Apr. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Debt Instrument [Line Items]              
Loss (gain) on extinguishment of debt, net       $ 249,000 $ 0 $ 249,000 $ 15,719,000
Debt issued           $ 1,588,549,000 2,036,964,000
Subsequent event              
Debt Instrument [Line Items]              
Loss (gain) on extinguishment of debt, net   $ 31,940,000          
LIBOR              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate           0.825%  
Senior unsecured notes              
Debt Instrument [Line Items]              
Debt extinguished           $ 0 1,050,000,000
Debt issued           1,600,000,000 $ 2,050,000,000
Senior unsecured notes | Term credit facility              
Debt Instrument [Line Items]              
Face amount     $ 1,000,000,000.0        
Debt instrument, term     2 years        
Senior unsecured notes | Term credit facility | Subsequent event              
Debt Instrument [Line Items]              
Debt extinguished $ 140,000,000            
Senior unsecured notes | Term credit facility | LIBOR              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     120.00%        
Senior unsecured notes | 2.75% senior unsecured notes              
Debt Instrument [Line Items]              
Face amount       $ 600,000,000   $ 600,000,000  
Interest rate     2.75%        
Senior unsecured notes | 3.75% senior unsecured notes | Subsequent event              
Debt Instrument [Line Items]              
Interest rate   3.75%          
Debt extinguished   $ 160,872,000          
Senior unsecured notes | 3.95% senior unsecured notes | Subsequent event              
Debt Instrument [Line Items]              
Interest rate   3.95%          
Debt extinguished   $ 265,376,000