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Stock-Based Compensation (Details) - USD ($)
shares in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 6,600,000 $ 6,300,000
2017 Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense   0
PRSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 300,000 800,000
PRSU expense | 2017 Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 650,000,000.0  
Percentage of target shares forfeited 33.33%  
PRSU expense | 2019 Aspirational Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 0  
Outstanding (in shares) 1.6  
PRSU expense | 2019 Aspirational Plan | 2018 Target    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting percentage 50.00%  
PRSU expense | 2019 Aspirational Plan | 2018 Target | Adjust EBITDA is $600 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000.0  
Award vesting percentage 66.00%  
PRSU expense | 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 $ 650,000,000.0  
Award vesting percentage 100.00%  
PRSU expense | 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]    
Award vesting percentage 50.00%  
PRSU expense | 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 $ 600,000,000.0  
PRSU expense | 2019 Aspirational Plan | 2017 Target | Adjust EBITDA is $600 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600,000,000.0  
Award vesting percentage 66.00%  
PRSU expense | 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 $ 650,000,000.0  
Award vesting percentage 100.00%  
PRSU expense | 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 $ 600,000,000.0  
PRSU expense | 2019 Aspirational Plan | First Designated Period    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total unrecognized stock-based compensation expense 93,600,000  
Option expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 1,200,000 1,900,000
RSU/DSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 5,100,000 $ 3,600,000
Minimum | PRSU expense | 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 600,000,000.0  
Minimum | PRSU expense | 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 600,000,000.0  
Maximum | PRSU expense | 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 650,000,000.0  
Maximum | PRSU expense | 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 $ 650,000,000.0