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Stock-Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) $ 4.7 $ 4.9 $ 15.3 $ 16.4
Accelerated amortization 0.9   2.0 4.9
PRSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) $ 1.8 3.0 $ 6.0 10.4
PRSU expense | Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding (in shares) 1.3   1.3  
Minimum Adjusted EBITDA (more than) $ 650.0   $ 650.0  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) 1.2 1.4 4.0 4.8
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense (benefit) 1.7 $ 0.5 $ 5.3 $ 1.2
2018 if target is met | PRSU expense | Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares to vest     33.33%  
If 2017 target is met | PRSU expense | Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense $ 92.4   $ 92.4