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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 |

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