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Long-term Debt (Tables)
 12 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
 
December 31,
Dollar amounts in millions
2018
 
2017
 
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

 
$
(3.7
)
 
$
346.3

 
$
350.0

 
$
(4.4
)
 
$
345.6

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

 
4.7

 
(0.1
)
 
4.6

 
7.7

 
(0.1
)
 
7.6

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

 
—

 
—

 
22.0

 
—

 
22.0

Other financing:
 
 
 
 
 
 
 
 
 
 
 
 
 
Capital leases
 
 
1.0

 
—

 
1.0

 
0.7

 
—

 
0.7

Total
 
 
355.7

 
(3.8
)
 
351.9

 
380.4

 
(4.5
)
 
375.9

Less: current portion
 
 
(5.0
)
 
—

 
(5.0
)
 
(25.1
)
 
—

 
(25.1
)
Net long-term portion
 
 
$
350.7

 
$
(3.8
)
 
$
346.9

 
$
355.3

 
$
(4.5
)
 
$
350.8
Schedule of Maturities of Long-term Debt [Table Text Block]
The weighted average interest rate for all long-term debt at December 31, 2018 and 2017 was approximately 4.9%  and 5.1% . Required repayment of principal for long-term debt is as follows:
 
Dollar amounts in millions
 
Years ending December 31,
 
2019
$
5.2

2020
0.2

2021
0.2

2022
0.1

2023
—

2024 and after
350.0

Total
$
355.7