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Commitments and Contingencies (Details 2) $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) single_family_property	Dec. 31, 2016 USD ($) single_family_property	Dec. 31, 2015 USD ($)
Commitments and contingencies
Number of real estate properties held-for-sale in escrow | single_family_property	69	57
Expected proceeds from sale of property held-for-sale	$ 7.0	$ 6.6
Company contributions	0.9	0.7	$ 0.5
Silver Bay Realty Trust Corp.
Commitments and contingencies
Gain on sale of equity instruments	3.0
Single Family
Commitments and contingencies
Single-family property commitments	128.1	37.8
Land
Commitments and contingencies
Single-family property commitments	$ 24.0	$ 3.9
Commitment to acquire properties
Commitments and contingencies
Number of properties | single_family_property	520	118

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- Definition

Expected Proceeds from Sale of Property Held-for-sale

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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.

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- Definition

The difference between the carrying value and the sale price of equity securities, not separately or otherwise categorized as trading or available-for-sale. This element includes investments in which the entity holds a small ownership stake (generally, less than 20% of the shares outstanding) and cannot exert significant influence.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 225
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-04.13(h))
-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

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- Definition

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

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- Definition

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

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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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