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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% |  |  |  |  |

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