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Non-operating Income (Expense) (Tables)
 12 Months Ended
Dec. 31, 2013
Nonoperating Income (Expense) [Abstract]  
Schedule of Other Nonoperating Income (Expense) [Table Text Block]
 
Year ended December 31,
Dollar amounts in millions
2013
 
2012
 
2011
Interest expense
$
(36.2
)
 
$
(48.0
)
 
$
(54.4
)
Amortization of debt charges
(1.4
)
 
(1.5
)
 
(2.6
)
Capitalized interest
1.6

 
0.2

 
0.1

Interest expense, net of capitalized interest
(36.0
)
 
(49.3
)
 
(56.9
)
Investment income
9.4

 
13.0

 
13.3

Realized gains from the sales of investments
—

 
—

 
15.2

SERP market adjustments
0.9

 
1.8

 
0.2

Investment income
10.3

 
14.8

 
28.7

Other than temporary impairment
—

 
—

 
(14.8
)
Foreign currency losses
(5.3
)
 
(2.7
)
 
(1.0
)
Gain on settlement of litigation related to ARS
—

 
20.0

 
—

Gain on acquisition
35.9

 
—

 
—

Gain on the sale of joint venture
1.2

 
—

 
—

Early debt extinguishment
(2.3
)
 
(52.2
)
 
—

Other non-operating income (expense)
29.5

 
(34.9
)
 
(1.0
)
Total non-operating income (expense)
$
3.8

 
$
(69.4
)
 
$
(44.0
)