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Notes Payable - Note Issuances Narrative (Details) | 1 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Jul. 31, 2021 USD ($) | Jan. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Oct. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | May 31, 2020 USD ($) | Jun. 30, 2019 USD ($) | May 31, 2019 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Jul. 31, 2021 GBP (£) | Oct. 31, 2020 GBP (£) | May 31, 2019 GBP (£)
Unsecured debt | Credit Facility |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  | $ 3,000,000,000 |  |  |  |  | $ 3,000,000,000 |  |  |  |
1.125% Notes due 2027 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 1.125% | 1.125% | 1.125% |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  | £ 400,000,000 | £ 400,000,000 |  |
Proceeds from issuance of debt | $ 546,300,000 |  |  |  |  |  |  |  |  |  |  |  |
1.750% Notes due 2033 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 1.75% | 1.75% | 1.75% |  |
Principal amount | £ |  |  |  |  |  |  |  |  |  | £ 350,000,000 | £ 350,000,000 |  |
Proceeds from issuance of debt | $ 480,600,000 |  |  |  |  |  |  |  |  |  |  |  |
1.800% Notes due 2033 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 1.80% |  |  |  |  |  | 1.80% | 1.80% |  |  |
Principal amount |  |  | $ 400,000,000 |  |  |  |  |  | $ 400,000,000 |  |  |  |
Proceeds from issuance of debt |  |  | $ 391,300,000 |  |  |  |  |  |  |  |  |  |
0.750% Notes due 2026 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  | 0.75% |  |  |  |  |  | 0.75% | 0.75% |  |  |
Principal amount |  |  | $ 325,000,000 |  |  |  |  |  | $ 325,000,000 |  |  |  |
Proceeds from issuance of debt |  |  | $ 320,300,000 |  |  |  |  |  |  |  |  |  |
3.250% Notes due 2022 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  | 3.25% | 3.25% |  |  |  |  |  |  |  |  |  |
Principal amount |  |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |
Early redemption of notes |  | $ 950,000,000 |  |  |  |  |  |  |  |  |  |  |
1.625% Notes due 2030 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  | 1.625% |  |  |  |  | 1.625% | 1.625% |  | 1.625% |
Principal amount | £ |  |  |  |  |  |  |  |  |  | £ 400,000,000 |  | £ 400,000,000 |
Proceeds from issuance of debt |  |  |  | $ 508,200,000 |  |  |  |  |  |  |  |  |
3.250% Notes, issued July 2020, due 2031 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 3.25% |  |  |  |  |  |  |  |
Principal amount |  |  |  |  | $ 350,000,000 |  |  |  | $ 350,000,000 |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 376,600,000 |  |  |  |  |  |  |  |
3.250% Notes, issued May 2020, due 2031 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  | 3.25% |  |  |  |  |  |  |
Principal amount |  |  |  |  |  | $ 600,000,000 |  |  | $ 600,000,000 |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 590,000,000 |  |  |  |  |  |  |
2.730% Notes due 2034 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  |  |  | 2.73% | 2.73% |  |  | 2.73%
Principal amount | £ |  |  |  |  |  |  |  |  |  | £ 315,000,000 |  |  | £ 315,000,000
Proceeds from issuance of debt |  |  |  |  |  |  |  | $ 400,900,000 |  |  |  |  |
3.250% Notes due 2029 | Notes payable |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (as a percent) |  |  |  |  |  |  | 3.25% |  | 3.25% | 3.25% |  |  |
Principal amount |  |  |  |  |  |  | $ 500,000,000 |  | $ 500,000,000 |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  |  | $ 493,500,000 |  |  |  |  |  |

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