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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 7.3 $ 6.6
Performance-based Restricted Stock Units    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 0.3 0.3
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 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 is less than $600.0 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA $ 600.0  
Performance-based Restricted Stock Units | 2019 Aspirational Plan | 2017 Target | Adjust EBITDA is $600 million    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Minimum Adjusted EBITDA 600.0  
Performance-based Restricted Stock Units | 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 $ 650.0  
Award vesting percentage 100.00%  
Option expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense $ 1.2 1.2
RSU/DSU expense    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Total stock-based compensation expense 5.8 $ 5.1
Minimum | Performance-based Restricted Stock Units | 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 600.0  
Minimum | 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 33.1  
Maximum | Performance-based Restricted Stock Units | 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 650.0  
Maximum | 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 $ 49.7