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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 6 Months Ended
May 31, 2020
Sep. 30, 2020
Mar. 31, 2020
May 31, 2018
Debt Instrument [Line Items]        
Debt issuance costs, net   $ 49,200,000 $ 67,900,000  
Debt instrument, unamortized discount   $ 641,600,000 1,043,200,000  
Senior Indebtedness        
Debt Instrument [Line Items]        
Debt issuance costs, net       $ 24,400,000
Debt instrument, unamortized discount       10,500,000
Senior Indebtedness | 2.670% 2023 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 1,000,000,000.00      
Debt instrument, interest rate, stated percentage 2.67% 2.67%    
Debt issuance costs, net   $ 1,600,000 0  
Debt instrument, unamortized discount   $ 2,700,000 0  
Senior Indebtedness | 2.670% 2023 Notes | Prior to September 1, 2023        
Debt Instrument [Line Items]        
Debt instrument, interest rate, stated percentage 2.67%      
Debt instrument, redemption price (percent) 100.00%      
Senior Indebtedness | 4.250% 2025 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 1,200,000,000      
Debt instrument, interest rate, stated percentage 4.25% 4.25%    
Debt issuance costs, net   $ 1,900,000 0  
Debt instrument, unamortized discount   $ 14,200,000 0  
Senior Indebtedness | 4.250% 2025 Notes | Prior to September 1, 2022        
Debt Instrument [Line Items]        
Debt instrument, redemption price (percent) 104.25%      
Debt instrument, redemption price, percentage of principal amount redeemed (percent) 40.00%      
Debt instrument, redemption, original aggregate principal amount required to remain outstanding after redemption (percent) 60.00%      
Debt instrument, redemption period following closing of equity offering 60 days      
Senior Indebtedness | 4.250% 2025 Notes | Prior to September 1, 2022, including premium        
Debt Instrument [Line Items]        
Debt instrument, redemption price (percent) 100.00%      
Debt instrument, redemption, premium on principal amount (percent) 1.00%      
Basis spread on treasury rate 50.00%      
Senior Indebtedness | 4.250% 2025 Notes | Twelve-month Period beginning September 1, 2022        
Debt Instrument [Line Items]        
Debt instrument, redemption price (percent) 102.125%      
Senior Indebtedness | 4.250% 2025 Notes | Twelve-month Period beginning September 1, 2023        
Debt Instrument [Line Items]        
Debt instrument, redemption price (percent) 101.063%      
Senior Indebtedness | 4.250% 2025 Notes | Twelve-month Period beginning September 1, 2024        
Debt Instrument [Line Items]        
Debt instrument, redemption price (percent) 100.00%      
Senior Indebtedness | 2.670% 2023 Notes and 4.250% 2025 Notes        
Debt Instrument [Line Items]        
Debt issuance costs, net $ 3,800,000      
Debt instrument, unamortized discount $ 18,000,000.0      
Debt instrument, redemption price (percent)   101.00%    
Senior Indebtedness | 3.922% 2021 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 1,000,000,000.00
Debt instrument, interest rate, stated percentage   3.922%   3.922%
Debt issuance costs, net   $ 2,700,000 4,800,000  
Debt instrument, unamortized discount   $ 1,200,000 2,100,000  
Senior Indebtedness | 4.333% 2023 Notes        
Debt Instrument [Line Items]        
Debt instrument, face amount       $ 1,000,000,000.00
Debt instrument, interest rate, stated percentage   4.333%   4.333%
Debt issuance costs, net   $ 6,600,000 7,700,000  
Debt instrument, unamortized discount   $ 2,900,000 $ 3,500,000