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Stock-Based Compensation (Details) - USD ($)
shares in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 5,900,000 $ 4,700,000 $ 8,500,000 $ 15,300,000
Tax benefit recognized     9,300,000  
Accelerated amortization 0 0 900,000 2,000,000
2017 Target        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense 83,900,000   83,900,000  
2017 Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 0 0 0 0
PRSU expense (benefit)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 1,000,000 1,800,000 $ (7,100,000) 6,000,000
PRSU expense (benefit) | 2017 Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Outstanding (in shares) 1.2   1.2  
Minimum Adjusted EBITDA $ 650,000,000   $ 650,000,000  
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]        
Total stock-based compensation expense $ 0   $ 0  
Grants in period 1.5      
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 $ 90,000,000   90,000,000  
PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period | Adjust EBITDA is $600 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum Adjusted EBITDA 600,000,000   $ 600,000,000  
Award vesting percentage     66.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period | Adjusted EBITDA equals or exceeds $650 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum Adjusted EBITDA 650,000,000   $ 650,000,000  
Award vesting percentage     100.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period | 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   $ 600,000,000  
PRSU expense (benefit) | 2019 Aspirational Plan | Second Designated Period | Adjust EBITDA is $600 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum Adjusted EBITDA 600,000,000   $ 600,000,000  
Award vesting percentage     66.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | Second Designated Period | Adjusted EBITDA equals or exceeds $650 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum Adjusted EBITDA 650,000,000   $ 650,000,000  
Award vesting percentage     100.00%  
PRSU expense (benefit) | 2019 Aspirational Plan | Second Designated Period | 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   $ 600,000,000  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1,800,000 1,200,000 5,600,000 4,000,000
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 3,100,000 $ 1,700,000 10,000,000 $ 5,300,000
Minimum | PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period | 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   600,000,000  
Minimum | PRSU expense (benefit) | 2019 Aspirational Plan | Second Designated Period | 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   600,000,000  
Maximum | PRSU expense (benefit) | 2019 Aspirational Plan | First Designated Period | 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   650,000,000  
Maximum | PRSU expense (benefit) | 2019 Aspirational Plan | Second Designated Period | 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   $ 650,000,000