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Accounting Standards and Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Millions | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 401.9 | $ 314.9
Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Typical contract term | 3 years |
Contract term | 1 year |
Accounts receivable payment term | 30 days |
Sales commissions amortization period | 3 years |
Maximum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Typical contract term | 5 years |
Contract term | 10 years |
Sales commissions amortization period | 7 years |
Subscription - Hosting Services | Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Contract term | 1 year |
Appraisal services | Minimum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Contract term | 1 year |
Appraisal services | Maximum |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Contract term | 3 years |
Unbilled Revenues |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 118.3 | 104.2
Retention Receivable | Unbilled Revenues |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |
Accounts receivable, net | $ 12.9 | $ 12.2

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- Definition Amount, after allowance for credit loss, of right to consideration from customer for product sold and service rendered in normal course of business. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(3)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(5)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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