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Stock-Based Compensation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense $ 7.5 $ 6.6 $ 14.8 $ 13.2
Performance-based Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 0.9 0.4 $ 1.2 0.7
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%  
Option expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 1.2 1.2 $ 2.4 2.4
RSU/DSU expense        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Total stock-based compensation expense 5.4 $ 5.0 11.2 $ 10.1
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  
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 33.0   33.0  
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  
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 $ 49.5   $ 49.5