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Long-term Debt Long-term Debt Required repayment of Principal (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2013
Chilean term credit facility maturing 2019
Debt instrument, periodic payment, principal     $ (5.5)
2014 2.3 97.8  
2015 2.2    
2016 2.1    
2017 7.2    
2018 396.0    
2019 and after 355.2    
Long-term debt $ 765.0 $ 880.5