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Stock-Based Compensation (Details) - USD ($)
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) $ 6,300,000 $ (3,400,000)
Tax benefit recognized   9,300,000
2017 Target    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized stock-based compensation expense 24,900,000  
PRSU expense (benefit)    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) 800,000 (9,300,000)
PRSU expense (benefit) | 2017 Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 650,000,000  
Target shares forfeited 66.66%  
Outstanding (in shares) 0.3  
PRSU expense (benefit) | 2017 Aspirational Plan | 2018 Target    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Percentage of target shares to vest 33.33%  
PRSU expense (benefit) | 2019 Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Grants in period 1.5  
PRSU expense (benefit) | 2019 Aspirational Plan | 2018 Target | Adjust EBITDA is $600 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000  
Award vesting percentage 66.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA equals or exceeds $650 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 650,000,000  
Award vesting percentage 100.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is less than $600.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000  
PRSU expense (benefit) | 2019 Aspirational Plan | 2017 Target | Adjust EBITDA is $600 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000  
Award vesting percentage 66.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA equals or exceeds $650 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 650,000,000  
Award vesting percentage 100.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is less than $600.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000  
PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized stock-based compensation expense 92,000,000  
Option expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) 1,900,000 2,000,000
RSU/DSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense (benefit) 3,600,000 $ 3,900,000
Minimum | PRSU expense (benefit) | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is between $600.0 million and $650.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA 600,000,000  
Minimum | PRSU expense (benefit) | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is between $600.0 million and $650.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA 600,000,000  
Maximum | PRSU expense (benefit) | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA is between $600.0 million and $650.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA 650,000,000  
Maximum | PRSU expense (benefit) | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA is between $600.0 million and $650.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 650,000,000