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Notes Payable - Note Issuances Narrative (Details) | 1 Months Ended |  |
--- | --- | --- | ---
Jan. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | May 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Apr. 30, 2018 USD ($) | Oct. 31, 2020 GBP (£) | May 31, 2019 GBP (£)
Notes payable | 1.800% notes, issued in December 2020 and due in March 2033 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 391,300,000 |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 1.80% |  |  |  |  |  |  |  |
Face amount of loan |  | $ 400,000,000.0 |  |  |  |  |  |  |  |
Notes payable | 0.750% notes, issued in December 2020 and due in March 2026 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  | $ 320,300,000 |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 0.75% |  |  |  |  |  |  |  |
Face amount of loan |  | $ 325,000,000.0 |  |  |  |  |  |  |  |
Notes payable | 3.250% notes due in October 2022 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 3.25% |  |  |  |  |  |  |  |
Notes payable | 3.250% notes due in October 2022 | Subsequent event |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Early repayment of notes payable | $ 950,000,000.0 |  |  |  |  |  |  |  |  |
Stated interest rate (as a percent) | 3.25% |  |  |  |  |  |  |  |  |
Notes payable | 1.625% notes, issued in October 2020 and due December 2030 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  | $ 508,200,000 |  |  |  |  |  |  |
Stated interest rate (as a percent) |  | 1.625% | 1.625% |  |  |  |  |  | 1.625% |
Face amount of loan | £ |  |  |  |  |  |  |  |  | £ 400,000,000 |
Notes payable | 3.250% notes, issued in July 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 376,600,000 |  |  |  |  |  |
Stated interest rate (as a percent) |  |  |  | 3.25% |  |  |  |  |  |
Face amount of loan |  |  |  | $ 350,000,000 |  |  |  |  |  |
Notes payable | 3.250% notes, issued in May 2020 and due in January 2031 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 590,000,000.0 |  |  |  |  |
Stated interest rate (as a percent) |  |  |  |  | 3.25% |  |  |  |  |
Face amount of loan |  |  |  |  | $ 600,000,000 |  |  |  |  |
Notes payable | 2.730% notes, issued in May 2019 and due in May 2034 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 400,900,000 |  |  |
Stated interest rate (as a percent) |  | 2.73% |  |  |  |  |  |  |  | 2.73%
Face amount of loan | £ |  |  |  |  |  |  |  |  |  | £ 315,000,000
Notes payable | 3.250% notes, issued in June 2019 and due in June 2029 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 493,500,000 |  |  |  |
Stated interest rate (as a percent) |  | 3.25% |  |  |  | 3.25% |  |  |  |
Face amount of loan |  |  |  |  |  | $ 500,000,000 |  |  |  |
Notes payable | 3.875% notes, issued in April 2018 and due in April 2025 |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  |  | $ 494,400,000 |  |
Stated interest rate (as a percent) |  | 3.875% |  |  |  |  |  | 3.875% |  |
Face amount of loan |  |  |  |  |  |  |  | $ 500,000,000 |  |
Unsecured debt | Credit Facility |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  | $ 3,000,000,000.0 | $ 3,000,000,000.0 |  |  |  |  |  |  |

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