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Stock-Based Compensation (Details) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) $ (3.4) $ 6.1
Tax benefit recognized 9.3  
Accelerated amortization 0.9 2.0
PRSU (benefit) expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) $ (9.3) 2.5
PRSU (benefit) expense | Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Outstanding (in shares) 1.2  
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) 2.0 1.7
RSU/DSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) $ 3.9 $ 1.9
2018 if target is met | PRSU (benefit) 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    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized stock-based compensation expense $ 84.1