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Contract Balances
 6 Months Ended
Jun. 30, 2018
Revenue from Contract with Customer [Abstract]  
Contract Balances
Contract Balances

Contract balances are set forth in the following table:
 
 
 
 
 
 
Balance Sheet Account
June 30, 2018
 
January 1, 2018
 
Change
Unbilled receivables - current & non-current (1)
$
180.0

 
$
149.1

 
$
30.9

Contract liabilities - current (2)
(656.8
)
 
(605.5
)
 
(51.3
)
Deferred revenue - non-current
(29.8
)
 
(31.8
)
 
2.0

Net contract assets/(liabilities)
$
(506.6
)
 
$
(488.2
)
 
$
(18.4
)
(1) Non-current unbilled receivables are reported in "Other assets" in our condensed consolidated balance sheets.
(2) Consists of "Deferred revenue", billings in-excess of revenues ("BIE") and customer deposits. BIE and customer deposits are reported in "Other accrued liabilities" in our condensed consolidated balance sheets.

The change in our net contract assets/(liabilities) from January 1, 2018 to June 30, 2018 was due primarily to the timing of payments and invoicing relating to SaaS and PCS renewals, partially offset by revenues recognized in the three and six months ended June 30, 2018 of $187.1 and $463.5, respectively, related to our contract liability balances at January 1, 2018. In addition, the impact of the 2018 acquisitions increased net contract liabilities by $26.0, partially offset by the classification of Gatan as held for sale, which decreased net contract liabilities by $15.3.

In order to determine revenues recognized in the period from contract liabilities, we allocate revenue to the individual deferred revenue, BIE or customer deposit 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 three and six months ended June 30, 2018.