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Deferred Revenue (Tables)
 12 Months Ended
Dec. 31, 2017
Deferred Revenue.  
Schedule of deferred revenue 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