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Deferred Revenue
 12 Months Ended
Dec. 31, 2017
Deferred Revenue.  
Deferred Revenue —Deferred Revenue
 
Deferred revenue consists primarily of unearned revenue related to separately priced extended warranty contracts on sales of certain products, the most significant being those offered on its installed roofing systems within the CCM segment. Other deferred revenue primarily relates to customer prepayments on sales within the CFT segment.

The amount of deferred revenue recognized related to separately priced extended product warranty contracts for the years ended December 31 follows:
(in millions)
 
2017
 
2016
 
2015
Extended product warranty contracts amortization
 
$
20.4

 
$
19.5

 
$
18.5

 
The deferred revenue liability as of December 31 is summarized as follows:
(in millions)
 
2017
 
2016
Extended product warranty contracts - current
 
$
19.8

 
$
18.8

Customer prepayments - current
 
8.0

 
4.4

Extended product warranty contracts - long-term
 
188.0

 
172.0

Deferred revenue
 
$
215.8

 
$
195.2


 
Expected costs of services to be performed under extended product warranty contracts are actuarially determined. Any expected costs in excess of the deferred revenue liability are recognized within accrued expenses.