Long-term Debt Issuance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Mar. 31, 2013 Chilean Bank Loan [Member] payments	Mar. 31, 2013 Chilian Term Credit Facility Maturing 2019 [Member]	Dec. 31, 2012 Chilian Term Credit Facility Maturing 2019 [Member]	Mar. 31, 2013 Brazilian Term Credit Facility Maturing 2017 [Member] payments	Dec. 31, 2012 Brazilian Term Credit Facility Maturing 2017 [Member]	Dec. 31, 2003 Brazilian Term Credit Facility Maturing 2017 [Member]	Mar. 31, 2013 Senior Notes Payable 2013 Thru 2018 [Member]	Dec. 31, 2012 Senior Notes Payable 2013 Thru 2018 [Member]	Dec. 31, 1998 Senior Notes Payable 2013 Thru 2018 [Member]	Mar. 31, 2013 Non Recourse Notes Payable 2018 [Member]	Dec. 31, 2012 Non Recourse Notes Payable 2018 [Member]	Dec. 31, 2003 Non Recourse Notes Payable 2018 [Member]	Mar. 31, 2013 Senior Notes due 2020 [Member]	Dec. 31, 2012 Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Amount of loan issuance									$ 10.0			$ 348.6			$ 368.7
Notes Payable	90.0		90.0		40.0	39.3	9.0	10.0		112.0	112.0		368.7	368.7		350.0	350.0
Maturity in 2013										90.0
Maturity in 2018										22.0
Notes receivable used as collateral on loan										113.7			410.0
Amount of indebtedness liable for in event of default of notes receivable collateral										10.00%			10.00%
Number of Future Semi Annual Payments				16			10
Repayment of long-term debt	$ 1.0	$ 0