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v3.23.1

Notes Payable - Narrative (Details) - Notes payable $ in Millions | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Mar. 31, 2023 GBP (£) | Mar. 31, 2022 GBP (£) | Jan. 31, 2022 GBP (£) | Jul. 31, 2021 GBP (£) | Oct. 31, 2020 GBP (£)
Debt |  |  |  |  |  |  |
Weighted average interest rate (as a percent) |  |  | 3.40% |  |  |  |
Weighted average remaining years until maturity | 6 years 9 months 18 days |  |  |  |  |  |
Interest incurred on notes and bonds | $ | $ 130.3 | $ 103.1 |  |  |  |  |
1.625% Notes due 2030 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Principal amount |  |  | £ 400,000,000 |  |  |  | £ 400,000,000
Interest rate (as a percent) |  |  | 1.625% |  |  |  | 0.01625%
1.125% Notes due 2027 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Principal amount |  |  | £ 400,000,000 |  |  | £ 400,000,000 |
Interest rate (as a percent) |  |  | 1.125% |  |  | 0.01125% |
1.750% Notes due 2033 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Principal amount |  |  | £ 350,000,000 |  |  | £ 350,000,000 |
Interest rate (as a percent) |  |  | 1.75% |  |  | 0.0175% |
1.875% Notes due 2027 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Principal amount |  |  | £ 250,000,000 | £ 250,000,000.0 | £ 250,000,000 |  |
Interest rate (as a percent) |  |  | 1.875% | 1.875% | 0.01875% |  |
2.500% Notes due 2042 |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Principal amount |  |  | £ 250,000,000 | £ 250,000,000.0 | £ 250,000,000 |  |
Interest rate (as a percent) |  |  | 2.50% | 2.50% | 0.025% |  |
Maximum |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt to total adjusted assets ratio (as a percent) | 60.00% |  |  |  |  |  |
Secured debt to total adjusted assets ratio (as a percent) | 40.00% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Debt service coverage ratio | 1.5 |  |  |  |  |  |
Total unencumbered assets as a percentage of outstanding unsecured debt | 150.00% |  |  |  |  |  |

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