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Commitments and Contingencies (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) property	Dec. 31, 2020 USD ($) property
Purchase Commitment [Line Items]
Single-family properties sales in escrow | property	53	97
Single-family properties sales in escrow, selling price	$ 14.9	$ 24.0
Surety bond
Purchase Commitment [Line Items]
Surety bonds related to development contracts	79.9	36.7
Single Family Properties
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	172.7	81.7
Land
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	$ 425.5	$ 72.3
Commitment To Acquire Properties
Purchase Commitment [Line Items]
Number of properties | property	564	323

X

- Definition

Expected Proceeds From Sale of Property Held-for-sale

+ References

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- Definition

Number of Real Estate Properties Held-for-Sale In Escrow

+ References

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- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=124440162&loc=d3e12069-110248

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- Definition

The minimum amount the entity agreed to spend under the long-term purchase commitment.

+ References

No definition available.

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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- Definition

The number of real estate properties owned as of the balance sheet date.

+ References

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