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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2017
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
 
December 31,
Dollar amounts in millions
2017
 
2016
 
Interest Rate
 
Principal
 
Unamortized Debt Costs
 
Total
 
Principal
 
Unamortized Debt Costs
 
Total
Debentures:
 
 
 
 
 
 
 
 
 
 
 
 
 
Senior unsecured notes, maturing 2024, interest rates fixed
4.875
%
 
$
350.0

 
$
(4.4
)
 
$
345.6

 
$
350.0

 
$
(5.0
)
 
$
345.0

Bank credit facilities:
 
 
 
 
 
 
 
 
 
 
 
 
 
Chilean term credit facility, maturing 2019, interest rates fixed
UF+3.9%

 
7.7

 
(0.1
)
 
7.6

 
7.0

 
(0.3
)
 
6.7

Brazilian export financing facility, maturing 2017, interest rates fixed
6.65
%
 
—

 
—

 
—

 
2.0

 
—

 
2.0

Limited recourse notes payable:
 
 
 
 
 
 
 
 
 
 
 
 
 
Senior notes, payable 2018, interest rates fixed
7.3
%
 
22.0

 
—

 
22.0

 
22.0

 
—

 
22.0

Other financing:
 
 
 
 
 
 
 
 
 
 
 
 
 
Capital leases
 
 
0.7

 
 
 
0.7

 
1.3

 
 
 
1.3

Total
 
 
380.4

 
(4.5
)
 
375.9

 
382.3

 
(5.3
)
 
377.0

Less: current portion
 
 
(25.1
)
 
 
 
(25.1
)
 
(2.6
)
 
 
 
(2.6
)
Net long-term portion
 
 
$
355.3

 
$
(4.5
)
 
$
350.8

 
$
379.7

 
$
(5.3
)
 
$
374.4
Schedule of Maturities of Long-term Debt [Table Text Block]
The weighted average interest rate for all long-term debt at December 31, 2017 and 2016 was approximately 5.1%  and 5.1% . Required repayment of principal for long-term debt is as follows:
 
Dollar amounts in millions
 
Years ending December 31,
 
2018
$
25.1

2019
5.3

2020
—

2021
—

2022
—

2023 and after
350.0

Total
$
380.4