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Debt - Senior Notes (Details) - USD ($)
1 Months Ended 9 Months Ended
Dec. 31, 2020
May 31, 2020
Dec. 31, 2020
Dec. 01, 2020
Mar. 31, 2020
May 31, 2018
Debt Instrument [Line Items]            
Debt issuance costs, net $ 38,000,000.0   $ 38,000,000.0   $ 67,900,000  
Debt instrument, unamortized discount $ 399,600,000   $ 399,600,000   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% 2.67%      
Debt issuance costs, net $ 1,400,000   $ 1,400,000   0  
Debt instrument, unamortized discount $ 2,500,000   $ 2,500,000   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% 4.25%      
Debt issuance costs, net $ 1,800,000   $ 1,800,000   0  
Debt instrument, unamortized discount $ 13,500,000   $ 13,500,000   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%     3.922%
Debt issuance costs, net $ 1,700,000   $ 1,700,000   4,800,000  
Debt instrument, unamortized discount $ 800,000   $ 800,000   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%     4.333%
Debt issuance costs, net $ 5,900,000   $ 5,900,000   7,700,000  
Debt instrument, unamortized discount 2,700,000   2,700,000   3,500,000  
Senior Indebtedness | 0.972% 2024 Notes            
Debt Instrument [Line Items]            
Debt instrument, face amount $ 1,400,000,000   $ 1,400,000,000      
Debt instrument, interest rate, stated percentage 0.972%   0.972%      
Debt issuance costs, net $ 2,200,000   $ 2,200,000   0  
Debt instrument, unamortized discount $ 4,100,000   $ 4,100,000 $ 4,200,000 $ 0  
Debt instrument, redemption price (percent)     101.00%      
Senior Indebtedness | 0.972% 2024 Notes | Debt Instrument, Redemption, Period One            
Debt Instrument [Line Items]            
Debt instrument, redemption price (percent) 100.00%