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Stock-Based Compensation (Details) - USD ($)
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 6,600,000 $ 6,800,000 $ 13,200,000 $ 13,100,000
PRSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 400,000 700,000 700,000 1,500,000
PRSU expense | 2017 Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum Adjusted EBITDA 650,000,000.0   $ 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   $ 0  
Outstanding (in shares) 1.6   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   $ 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   $ 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   $ 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   $ 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   $ 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   $ 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 93,300,000   93,300,000  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1,200,000 1,900,000 2,400,000 3,800,000
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 5,000,000.0 $ 4,200,000 10,100,000 $ 7,800,000
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   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   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   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   $ 650,000,000.0