Long-term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments [Table Text Block]

	December 31,
Dollar amounts in millions	2016											2015
	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		$	(5.0	)	$	345.0		$	—		$	—		$	—
Senior unsecured notes, maturing 2020 (redeemed 2016), interest rates fixed	7.5	%	—			—			—			350.0			(3.7		)	346.3
Bank credit facilities:
Chilean term credit facility, maturing 2019, interest rates fixed	UF+3.9%		7.0			(0.3		)	6.7			12.8			—			12.8
Brazilian export financing facility, maturing 2017, interest rates fixed	6.65	%	2.0			—			2.0			4.0			—			4.0
Limited recourse notes payable:
Senior notes, payable 2018, interest rates fixed	7.3	%	22.0			—			22.0			22.0			—			22.0
Other financing:
Non-recourse notes payable 2018, (repaid 2016) interest rates variable			—			—			—			368.7			(0.2		)	368.5
Other			1.3						1.3			0.3						0.3
Total			382.3			(5.3		)	377.0			757.8			(3.9		)	753.9
Less: current portion			(2.6		)				(2.6		)	(2.1		)				(2.1		)
Net long-term portion			$	379.7		$	(5.3	)	$	374.4		$	755.7		$	(3.9	)	$	751.8

Schedule of Maturities of Long-term Debt [Table Text Block]

The weighted average interest rate for all long-term debt at December 31, 2016 and 2015 was approximately 5.1%  and 4.0% . Required repayment of principal for long-term debt is as follows:

Dollar amounts in millions
Years ending December 31,
2017	$	2.6
2018	24.9
2019	4.8
2020	—
2021	—
2022 and after	350.0
Total	$	382.3