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Deferred Revenue (Tables)
 9 Months Ended
Sep. 30, 2018
Deferred Revenue Disclosure [Abstract]  
Deferred Revenue from Extended Product Warranty Liabilities

The following table reflects changes in the carrying values of deferred revenue:

 

 

September 30,

2018

 

 

December 31,

2017

 

(Dollars in millions)

 

 

 

 

 

 

 

 

Balance at beginning of year

 

$

28.1

 

 

$

27.2

 

Revenue earned

 

 

(0.5

)

 

 

(0.7

)

Currency translation

 

 

(1.6

)

 

 

1.6

 

Balance at end of period

 

$

26.0

 

 

$

28.1