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Contract Balances | 12 Months Ended
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Dec. 31, 2020
Revenue from Contract with Customer [Abstract] |
Contract Balances | Contract Balances Contract balances at December 31 are set forth in the following table:
Balance Sheet Account | 2020 |  | 2019 |  | Change
Unbilled receivables | $ | 241.7 |  |  | $ | 183.5 |  |  | $ | 58.2 |
Contract liabilities - current (1) | (1,012.0) |  |  | (840.8) |  |  | (171.2) |
Deferred revenue - non-current | (43.1) |  |  | (33.2) |  |  | (9.9) |
Net contract assets/(liabilities) | $ | (813.4) |  |  | $ | (690.5) |  |  | $ | (122.9) |
(1) Consists of “Deferred revenue,” and billings in-excess of revenues (“BIE”). BIE are reported in “Other accrued liabilities” in our Consolidated Balance Sheets. The change in our net contract assets/(liabilities) from December 31, 2019 to December 31, 2020 was due primarily to the increase in our contract liabilities associated with the timing of payments and invoicing relating to SaaS and PCS renewals and the net contract liabilities associated with the acquisitions completed during the year ended December 31, 2020, of $78.2, partially offset by the increase in unbilled receivables associated with timing of invoicing in our project-based businesses, most notably our Transcore business. Revenue recognized during the year ended December 31, 2020 and 2019 that was included in the contract liability balance on December 31, 2019 and 2018 was $804.4 and $674.2, respectively. In order to determine revenues recognized in the period from contract liabilities, we allocate revenue to the individual deferred revenue or BIE balance outstanding at the beginning of the year until the revenue exceeds that balance. Impairment losses recognized on our accounts receivable and unbilled receivables were immaterial in the year ended December 31, 2020.

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- Definition The entire disclosure of revenue from contract with customer to transfer good or service and to transfer nonfinancial asset. Includes, but is not limited to, disaggregation of revenue, credit loss recognized from contract with customer, judgment and change in judgment related to contract with customer, and asset recognized from cost incurred to obtain or fulfill contract with customer. Excludes insurance and lease contracts. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -URI http://asc.fasb.org/topic&trid=49130388 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 13 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130550-203045 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130558-203045 Reference 10: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130554-203045 + Details
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