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Commitments and Contingencies - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($) singleFamilyProperty | Dec. 31, 2019 USD ($) singleFamilyProperty | Dec. 31, 2018 USD ($)
Commitments and contingencies |  |  |
Number of real estate properties held-for-sale in escrow | singleFamilyProperty | 97 | 305 |
Expected proceeds from sale of property held-for-sale | $ 24.0 | $ 57.5 |
Company contributions | 2.0 | 1.6 | $ 1.3
Surety Bond |  |  |
Commitments and contingencies |  |  |
Current carrying value | 36.7 | 14.5 |
Single Family |  |  |
Commitments and contingencies |  |  |
Third party development agreements and land | 81.7 | 75.1 |
Land |  |  |
Commitments and contingencies |  |  |
Third party development agreements and land | $ 72.3 | $ 44.3 |
Commitment to acquire properties |  |  |
Commitments and contingencies |  |  |
Number of properties | singleFamilyProperty | 323 | 289 |
Minimum |  |  |
Commitments and contingencies |  |  |
Operating leases have remaining lease terms | 1 year |  |
Maximum |  |  |
Commitments and contingencies |  |  |
Operating leases have remaining lease terms | 11 years |  |

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- Definition Remaining lease term of operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980 + Details
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