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Stock-Based Compensation (Details) - USD ($)
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 6,000,000 $ 4,500,000 $ 2,600,000 $ 10,600,000
Tax benefit recognized     9,300,000  
Accelerated amortization 0 0 900,000 2,000,000
If 2017 target is met        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense 83,900,000   83,900,000  
PRSU expense (benefit)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,200,000 1,700,000 $ (8,100,000) 4,200,000
PRSU expense (benefit) | Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding (in shares) 1.2   1.2  
Minimum Adjusted EBITDA (more than) $ 650,000,000   $ 650,000,000  
PRSU expense (benefit) | Aspirational Plan | 2018 if target is met        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares to vest     33.33%  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1,800,000 1,100,000 $ 3,800,000 2,800,000
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 3,000,000 $ 1,700,000 $ 6,900,000 $ 3,600,000