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Contract Balances
 12 Months Ended
Dec. 31, 2019
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
2019
 
2018
 
Change
Unbilled receivables
$
183.5

 
$
169.4

 
$
14.1

Contract liabilities - current (1)
(840.8
)
 
(714.1
)
 
(126.7
)
Deferred revenue - non-current
(33.2
)
 
(29.8
)
 
(3.4
)
Net contract assets/(liabilities)
$
(690.5
)
 
$
(574.5
)
 
$
(116.0
)

(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, 2018 to December 31, 2019 was due primarily to the timing of payments and invoicing relating to SaaS and PCS renewals, partially offset by revenues recognized in the year ended December 31, 2019 of $674.2, related to our contract liability balances at December 31, 2018. In addition, the impact of the 2019 business acquisitions increased net contract liabilities by $96.2.

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, 2019.