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Stock-Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation expense (benefit) $ 4.5 $ 7.6 $ 10.6 $ 11.6  
Accelerated amortization     2.0 4.0  
PRSU expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation expense (benefit) $ 1.7 5.4 $ 4.2 7.4  
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
Option expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation expense (benefit) $ 1.1 2.0 $ 2.8 3.5  
RSU/DSU expense          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Total stock-based compensation expense (benefit) 1.7 $ 0.2 3.6 $ 0.7  
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