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Commitments and Contingencies (Details) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2020 USD ($) property	Dec. 31, 2019 USD ($) property
Purchase Commitment [Line Items]
Single-family properties sales in escrow | property	108	305
Single-family properties sales in escrow, selling price	$ 26.7	$ 57.5
Estimated litigation liability	2.9
Surety bond
Purchase Commitment [Line Items]
Surety bonds related to development contracts	36.0	14.5
Single Family Properties
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	99.8	75.1
Land
Purchase Commitment [Line Items]
Purchase price of commitment to acquire single-family properties	$ 65.5	$ 44.3
Commitment To Acquire Properties
Purchase Commitment [Line Items]
Number of properties | property	396	289

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Expected Proceeds from Sale of Property Held-for-sale

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- Definition

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

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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
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Aggregate carrying amount of the estimated litigation liability for known or estimated probable loss from litigation, which may include attorneys' fees and other litigation costs.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
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-Name Accounting Standards Codification
-Topic 210
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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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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.

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

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