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Subsequent Events (Narrative) (Details) $ / shares in Units, ft² in Thousands, $ in Millions |  |  | 2 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Feb. 04, 2023 $ / shares | Feb. 03, 2023 $ / shares | Feb. 21, 2023 USD ($) ft² storage_facility state | Dec. 31, 2022 USD ($) ft² | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Subsequent Event [Line Items] |  |  |  |  |  |
Net rentable area (in square feet) | ft² |  |  |  | 204,217 |  |
Acquisition of Self-Storage Facilities Other Investments |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Total cost of acquisition | $ |  |  |  | $ 730.5 | $ 5,100.0 | $ 792.3
Subsequent Event |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Increase in regular common dividend | 50.00% |  |  |  |  |
Common stock, quarterly dividends (in USD per share) | $ / shares | $ 3.00 | $ 2.00 |  |  |  |
Common stock, annual dividends (in USD per share) | $ / shares | $ 12.00 | $ 8.00 |  |  |  |
Subsequent Event | Acquisition of Self-Storage Facilities Other Investments |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |
Number of self-storage facilities acquired or under contract to be acquired | storage_facility |  |  | 8 |  |  |
Number of states self-storage facilities acquired or under contracts to be acquired | state |  |  | 5 |  |  |
Net rentable area (in square feet) | ft² |  |  | 500 |  |  |
Total cost of acquisition | $ |  |  | $ 70.5 |  |  |

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