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Share-Based Compensation Arrangements (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Stock Appreciation Rights (SARs) [Member]
       
Fair value of stock appreciation rights        
Dividend yield     0.00% 0.00%
Volatility     59.30% 61.31%
Stock Appreciation Rights (SARs) [Member] | Maximum [Member]
       
Fair value of stock appreciation rights        
Risk-free interest rate     0.74% 0.73%
Expected life (years)     2 years 3 months 18 days 3 years 3 months 18 days
Stock Appreciation Rights (SARs) [Member] | Minimum [Member]
       
Fair value of stock appreciation rights        
Risk-free interest rate     0.02% 0.18%
Expected life (years)     0 years 4 months 25 days 1 year 4 months 25 days
Phantom Share Units (PSUs) [Member]
       
Fair value of stock appreciation rights        
Share based compensation, unrecognized liability $ 0   $ 0  
DSUs [Member]
       
Fair value of stock appreciation rights        
Share based compensation expense 0 (0.2) (0.2) 0.8
Restricted Stock Units (RSUs) [Member]
       
Fair value of stock appreciation rights        
Share based compensation expense $ 0.1   $ 0.1