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Contract Balances (Tables)
 12 Months Ended
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]  
Contract Balances
Contract balances are set forth in the following table:
 
 
 
 
 
 
Balance Sheet Account
December 31, 2018
 
January 1, 2018
 
Change
Unbilled receivables - current
$
169.4

 
$
149.1

 
$
20.3

Contract liabilities - current (1)
(714.1
)
 
(605.5
)
 
(108.6
)
Deferred revenue - non-current
(29.8
)
 
(31.8
)
 
2.0

Net contract assets/(liabilities)
$
(574.5
)
 
$
(488.2
)
 
$
(86.3
)
(1) 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 consolidated balance sheets.