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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 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 + Details
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