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Capital Stock and Share Based Compensation Plans - Options outstanding and exercisable (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Information about options outstanding and options exercisable by year of grant        
Range of Exercise Prices, Lower Range Limit (USD per share) $ 6      
Range of Exercise Prices, Upper Range Limit (USD per share) $ 9      
Options on Shares Outstanding   1,703,876 3,370,048 8,011,380
Options on Shares Exercisable 996,879      
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 7.45 $ 8.92 $ 9.46 $ 9.77
Options Outstanding, Weighted Average Exercise Price (USD per share) 7.45 $ 8.92 $ 9.46 $ 9.77
2006 – expire in 2016        
Information about options outstanding and options exercisable by year of grant        
Range of Exercise Prices, Lower Range Limit (USD per share) 9      
Range of Exercise Prices, Upper Range Limit (USD per share) 9      
2007 – expire in 2017        
Information about options outstanding and options exercisable by year of grant        
Range of Exercise Prices, Lower Range Limit (USD per share) 8      
Range of Exercise Prices, Upper Range Limit (USD per share) 8      
2008 - expire in 2018        
Information about options outstanding and options exercisable by year of grant        
Range of Exercise Prices, Lower Range Limit (USD per share) 6      
Range of Exercise Prices, Upper Range Limit (USD per share) $ 9      
Stock Options        
Information about options outstanding and options exercisable by year of grant        
Average Remaining Term 1 year 3 months 10 days      
Options on Shares Outstanding 996,879      
Options on Shares Exercisable 996,879      
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 7.45      
Options Outstanding, Weighted Average Exercise Price (USD per share) $ 7.45      
Options Outstanding, Aggregate Intrinsic Value $ 11.5      
Options Exercisable, Aggregate Intrinsic Value $ 11.5      
Stock Options | 2006 – expire in 2016        
Information about options outstanding and options exercisable by year of grant        
Average Remaining Term 4 months 1 day      
Options on Shares Outstanding 37,313      
Options on Shares Exercisable 37,313      
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 8.78      
Options Outstanding, Weighted Average Exercise Price (USD per share) $ 8.78      
Options Outstanding, Aggregate Intrinsic Value $ 0.4      
Options Exercisable, Aggregate Intrinsic Value $ 0.4      
Stock Options | 2007 – expire in 2017        
Information about options outstanding and options exercisable by year of grant        
Average Remaining Term 1 year 3 months 25 days      
Options on Shares Outstanding 37,313      
Options on Shares Exercisable 37,313      
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 8.14      
Options Outstanding, Weighted Average Exercise Price (USD per share) $ 8.14      
Options Outstanding, Aggregate Intrinsic Value $ 0.4      
Options Exercisable, Aggregate Intrinsic Value $ 0.4      
Stock Options | 2008 - expire in 2018        
Information about options outstanding and options exercisable by year of grant        
Average Remaining Term 1 year 3 months 25 days      
Options on Shares Outstanding 922,253      
Options on Shares Exercisable 922,253      
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 7.37      
Options Outstanding, Weighted Average Exercise Price (USD per share) $ 7.37      
Options Outstanding, Aggregate Intrinsic Value $ 10.7      
Options Exercisable, Aggregate Intrinsic Value $ 10.7