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Significant Transactions During the Six Months Ended June 30, 2022 and Subsequent Events (Details) $ / shares in Units, $ in Millions | 1 Months Ended | 3 Months Ended
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Jun. 30, 2022 USD ($) | Apr. 30, 2022 USD ($) | Mar. 31, 2022 USD ($) | Jan. 31, 2022 USD ($) apartment | Nov. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) $ / shares shares | Mar. 31, 2022 USD ($) investment
Other Commitments [Line Items] |  |  |  |  |  |  |
Shares repurchased and retired during period (in shares) | shares |  |  |  |  |  | 218,960 |
Shares repurchased and retired during period, value |  |  |  |  |  | $ 60.8 |
Treasury stock acquired, average cost per share (in dollars per share) | $ / shares |  |  |  |  |  | $ 277.81 |
Purchase authority remaining under stock repurchase plan | $ 153.6 |  |  |  |  | $ 153.6 |
Stock repurchase plan amount | 250.0 |  |  |  |  | $ 250.0 |
Related Party Bridge Loan on Property In Vista, CA |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Proceeds from redemption of notes receivable |  |  |  | $ 48.5 |  |  |
Affiliated Entity | Related Party Bridge Loan on Property In Vista, CA |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  |  |  | $ 48.4 |  |
Interest rate |  |  |  |  | 2.36% |  |
Affiliated Entity | Related Party Bridge Loan On Property Acquired By BEX II |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  | $ 32.8 |  | $ 32.8 |  | $ 32.8
Interest rate |  |  | 1.35% |  | 1.35% |  |
Wesco IV |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Limited partnership interest in partnership investments |  | 65.10% |  |  |  |  |
Promote interest |  | $ 37.5 |  |  |  |  |
Preferred Equity Investment Property In Northern California |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment | $ 3.0 |  |  |  |  |  |
Preferred Equity Investment Property in Southern California and Washington |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of preferred equity investments | investment |  |  |  |  |  |  | 3
Commitments to acquire equity method investment |  |  |  |  |  |  | $ 29.5
Preferred return rate |  |  |  |  |  |  | 10.00%
Joint Venture That Holds Property In California |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Proceeds from partial redemption of co-investment |  |  |  |  |  |  | $ 106.9
Early redemption fee |  |  |  |  |  |  | $ 0.9
Number of preferred equity investments fully redeemed | investment |  |  |  |  |  |  | 2
Number of preferred equity investments partially redeemed | investment |  |  |  |  |  |  | 2
Vela On Ox | Affiliated Entity | Related Party Bridge Loan on Property Acquired By Wesco VI |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Notes receivable |  |  |  | $ 100.7 |  |  |
Interest rate |  |  |  | 2.64% |  |  |
Proceeds from redemption of notes receivable |  |  |  | $ 121.3 |  |  |
Vela On Ox | Wesco VI |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Payments to acquire real estate |  |  |  | $ 183.0 |  |  |
Vela On Ox | Apartment Building | Wesco VI |  |  |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |  |  |
Number of units acquired | apartment |  |  |  | 379 |  |  |

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