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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, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
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   486,914 996,879 1,703,876
Options on Shares Exercisable 251,507      
Options Outstanding, Weighted Average Exercise Price (USD per share) $ 7.38 $ 6.81 $ 7.45 $ 8.92
Options Exercisable, Weighted Average Exercise Price (USD per share) $ 7.38 $ 6.81 $ 8.92
Stock Options        
Information about options outstanding and options exercisable by year of grant        
Options Exercisable, Aggregate Intrinsic Value $ 2.1