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Share-Based Compensation - Narrative (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
1 Months Ended 3 Months Ended 6 Months Ended
Mar. 31, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Share and cash based compensation   $ 9.4 $ 2.8 $ 16.2 $ 3.1
Restricted stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Annual share-based compensation grants 0.8        
Grant date fair value $ 4.52        
Graded vesting period 3 years        
Dividend payable $ 0.0        
Shares outstanding   1.5   1.5  
Performance share units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Annual share-based compensation grants 0.8        
Grant date fair value $ 4.52        
Cliff vesting period 3 years        
Shares outstanding   2.2   2.2  
Phantom restricted stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Annual share-based compensation grants 0.9        
Grant date share price $ 4.52        
Payment description       payable in three equal installments over a period of three years after the grant date  
Payment term 3 years        
Phantom performance stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Annual share-based compensation grants 0.9        
Cliff vesting period 3 years        
Shares outstanding   2.4   2.4  
Grant date share price $ 4.52        
Phantom stock units          
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]          
Dividend payable $ 0.0        
Shares outstanding   2.1   2.1