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Commitments and Contingencies - Narrative (Details) $ in Millions	12 Months Ended
	Dec. 31, 2021 USD ($) singleFamilyProperty	Dec. 31, 2020 USD ($) singleFamilyProperty	Dec. 31, 2019 USD ($)
Commitments and contingencies
Number of real estate properties held-for-sale in escrow | singleFamilyProperty	111	97
Expected proceeds from sale of property held-for-sale	$ 39.2	$ 24.0
Company contributions	2.5	2.0	$ 1.6
Surety Bond
Commitments and contingencies
Current carrying value	112.4	36.7
Single Family
Commitments and contingencies
Third party development agreements and land	160.4	81.7
Land
Commitments and contingencies
Third party development agreements and land	$ 409.0	$ 72.3
Commitment to acquire properties
Commitments and contingencies
Number of properties | singleFamilyProperty	482	323
Minimum
Commitments and contingencies
Operating leases have remaining lease terms	1 year
Maximum
Commitments and contingencies
Operating leases have remaining lease terms	10 years

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- 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

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ 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)
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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=123408670&loc=SL77918673-209980

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- Definition

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

+ References

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- Definition

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

+ References

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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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