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Contract Balances (Tables)
 12 Months Ended
Dec. 31, 2019
Revenue from Contract with Customer [Abstract]  
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.