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Stock-Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense (benefit) $ 6.1 $ 4.0  
Accelerated amortization 2.0    
PRSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense (benefit) 2.5 2.0  
PRSU | Aspirational Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Granted (in shares)     1.4
Minimum Adjusted EBITDA (more than)     $ 650.0
Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense (benefit) 1.7 1.5  
RSU/DSU      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total stock-based compensation expense (benefit) 1.9 $ 0.5  
2018 if target is met | PRSU | 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 | Aspirational Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total unrecognized stock-based compensation expense $ 101.1