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Stock-Based Compensation - Components of stock-based compensation expense (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) $ 7.6 $ 1.3 $ 11.6 $ 5.4
Accelerated amortization $ 4.0   $ 4.0  
Fair value assumptions and methodology        
Expected volatility range of stock, minimum (as a percent) 35.10% 58.30% 35.10% 58.30%
Expected volatility range of stock, maximum (as a percent) 35.40% 66.50% 36.20% 66.50%
Expected life of option, range in years, minimum 3 years 2 years 3 years 2 years
Expected life of option, range in years, maximum 5 years 4 years 5 years 4 years
Risk-free interest range rate, minimum (as a percent) 1.00% 0.40% 1.00% 0.40%
Risk-free interest range rate, maximum (as a percent) 1.50% 1.20% 1.50% 1.20%
Expected dividend yield on stock, minimum (as a percent) 0.00% 0.60% 0.00% 0.60%
Expected dividend yield on stock, maximum (as a percent) 0.00% 0.70% 0.00% 0.70%
PRSU expense (benefit)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) $ 5.4 $ (0.9) $ 7.4 $ 0.2
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) 2.0 1.7 3.5 3.4
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) $ 0.2 0.5 0.7 1.8
PRSU and Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit)     $ 0.5  
PRSU after re-evaluation        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit)   $ (3.0)   $ (3.0)