Long-term Debt Issuance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended			9 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011	Sep. 30, 2012 Chilean Bank Loan [Member] payments	Sep. 30, 2012 Chilian Term Credit Facility Maturing 2019 [Member]	Dec. 31, 2011 Chilian Term Credit Facility Maturing 2019 [Member]	Sep. 30, 2012 Brazilian Term Credit Facility Maturing 2017 [Member] payments	Dec. 31, 2011 Brazilian Term Credit Facility Maturing 2017 [Member]	Sep. 30, 2012 Senior Notes Payable 2012 [Member]	Dec. 31, 2011 Senior Notes Payable 2012 [Member]	Dec. 31, 1997 Senior Notes Payable 2012 [Member]	Sep. 30, 2012 Senior Notes Payable 2013 Thru 2018 [Member]	Dec. 31, 2011 Senior Notes Payable 2013 Thru 2018 [Member]	Dec. 31, 1998 Senior Notes Payable 2013 Thru 2018 [Member]	Sep. 30, 2012 Non Recourse Notes Payable 2018 [Member]	Dec. 31, 2011 Non Recourse Notes Payable 2018 [Member]	Dec. 31, 2003 Non Recourse Notes Payable 2018 [Member]	Sep. 30, 2012 Senior Secured Notes Maturing 2017 [Member]	Dec. 31, 2011 Senior Secured Notes Maturing 2017 [Member]	Sep. 30, 2012 Senior Notes due 2020 [Member]	Dec. 31, 2011 Senior Notes due 2020 [Member]
Debt Instrument [Line Items]
Amount of loan issuance													$ 47.9			$ 348.6			$ 368.7
Notes Payable	97.9		97.9		7.9		42.2	40.5	10.0	10.0	7.9	7.9		112.0	112.0		368.7	368.7		0	189.6	350.0	0
Maturity in 2013														90.0
Maturity in 2018														22.0
Notes receivable used as collateral on loan	9.9		9.9											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	0.2	0.1	242.3	0.2			2.7
Gains (Losses) on Extinguishment of Debt	0	0	52.2	0
Write off of Deferred Debt Issuance Cost	$ (4.5)