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Non-operating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2017
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
 
Year ended December 31,
Dollar amounts in millions
2017
 
2016
 
2015
Interest expense
$
(20.6
)
 
$
(32.9
)
 
$
(32.0
)
Amortization of debt charges
(0.9
)
 
(1.1
)
 
(1.1
)
Capitalized interest
2.2

 
1.9

 
1.9

Interest expense, net of capitalized interest
(19.3
)
 
(32.1
)
 
(31.2
)
Investment income
9.5

 
8.0

 
4.9

SERP market adjustments
1.0

 
0.2

 
(0.5
)
Investment income
10.5

 
8.2

 
4.4

Foreign currency losses
(4.4
)
 
2.1

 
(5.3
)
Early debt extinguishment
—

 
(17.3
)
 
—

Other non-operating income (expense)
(4.4
)
 
(15.2
)
 
(5.3
)
Total non-operating income (expense)
$
(13.2
)
 
$
(39.1
)
 
$
(32.1
)