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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 71.8 $ 6.8 $ 86.6 $ 20.0
Performance-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 65.0 0.3 $ 66.2 1.0
Performance-based Restricted Stock Units | 2019 Aspirational Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 45.2      
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2018 Target        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of target shares forfeited     50.00%  
Award vesting percentage     50.00%  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2018 Target | Adjust EBITDA per Credit Facility is $600 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award vesting percentage     66.00%  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA per Credit Facility is less than $600.0 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum adjusted EBITDA per credit facility 600.0   $ 600.0  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2017 Target | Adjust EBITDA per Credit Facility is $600 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum adjusted EBITDA per credit facility 600.0   600.0  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA per Credit Facility equals or exceeds $650 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum adjusted EBITDA per credit facility 650.0   $ 650.0  
Award vesting percentage     100.00%  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | First Designated Period        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total unrecognized stock-based compensation expense 4.2   $ 4.2  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1.3 1.3 3.7 3.7
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 5.5 $ 5.2 16.7 $ 15.3
Minimum | Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2018 Target | Adjusted EBITDA per Credit Facility is between $600.0 million and $650.0 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum adjusted EBITDA per credit facility 600.0   600.0  
Maximum | Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2017 Target | Adjusted EBITDA per Credit Facility is between $600.0 million and $650.0 million        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Minimum adjusted EBITDA per credit facility $ 650.0   $ 650.0