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Debt - Unsecured Revolving Credit and Term Loan Facilities (Details) - Revolving Credit Facility |  | 12 Months Ended |
--- | --- | --- | ---
Mar. 19, 2020 USD ($) option | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 USD ($)
Unsecured Revolving Credit Facility and Term Loan |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,315,000,000 |  |  |
Unsecured revolving credit facility, higher borrowing capacity option | 1,750,000,000 |  |  |
Unsecured revolving credit facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 1,100,000,000 |  |  |
Outstanding borrowings |  |  |  | $ 550,000,000.0
Number of options to extend maturity | option | 2 |  |  |
Extension period (in months) | 6 months |  |  |
Term loan facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | $ 215,000,000.0 |  |  |
Outstanding borrowings |  |  |  | 215,000,000.0
Unsecured term loan facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Maximum borrowing capacity | 175,000,000 |  |  |
Unsecured revolving credit facility, higher borrowing capacity option | $ 225,000,000 |  |  |
Outstanding borrowings |  |  |  | $ 175,000,000.0
Minimum | Unsecured revolving credit facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Extension fee, as a percent of outstanding commitments under revolving credit facility (percentage) | 0.0625% |  |  |
Maximum | Unsecured revolving credit facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Extension fee, as a percent of outstanding commitments under revolving credit facility (percentage) | 0.075% |  |  |
Forecast | Unsecured term loan facility |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |
Prepayment fee, percent of principal amount prepaid |  | 1.00% | 2.00% |

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