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Related Party Transactions (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) commercial_unit | Dec. 31, 2018 USD ($)
The Collection High-rise Residential Condominium | Hawaii |  |  |
Related Party Transaction [Line Items] |  |  |
Number of units acquired | commercial_unit |  | 5 |
Payments to acquire real estate |  | $ 6.9 |
Affiliated Entity | Materials & Construction | Supplier Contracts |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | $ 7.4 | 10.5 | $ 16.6
Receivables from related parties | 0.9 | 0.2 |
Payables to related parties | 0.3 | 1.2 |
Affiliated Entity | Real estate leasing and development | Lease Agreements |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties |  | 1.3 | 4.3
Expenses related to affiliates | 1.1 | 0.1 | 0.1
Affiliated Entity | Land Operations | Land Operations |  |  |
Related Party Transaction [Line Items] |  |  |
Revenue from related parties | 3.1 | 2.2 | $ 1.1
Affiliated Entity | Land Operations | Service Revenues and Interest |  |  |
Related Party Transaction [Line Items] |  |  |
Receivables from related parties | 0.1 | 0.1 |
Affiliated Entity | Land Operations | Extension of Secured Note Receivable |  |  |
Related Party Transaction [Line Items] |  |  |
Receivable from affiliate | $ 9.5 | $ 13.1 |

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