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Product Warranty (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Schedule of Product Warranty Liability [Table Text Block]
The activity in warranty reserves for the last three years is summarized in the following table.
 
  
Year ended December 31,
Dollar amounts in millions
2017
 
2016
 
2015
Beginning balance
$
24.1

 
$
21.0

 
$
31.4

Accrued to expense during the year
1.0

 
0.8

 
0.7

Accrued/ (credited) to other operating credits and charges
5.4

 
16.9

 
(1.4
)
Accrued to discontinued operations
1.5

 
0.5

 
2.5

Foreign currency translation
2.2

 
(0.2
)
 
(0.5
)
Payments made
(9.5
)
 
(14.9
)
 
(11.7
)
Total warranty reserves
24.7

 
24.1

 
21.0

Current portion of warranty reserves
(9.0
)
 
(9.0
)
 
(6.0
)
Long term portion of warranty reserves
$
15.7

 
$
15.1

 
$
15.0