Quarterly report pursuant to Section 13 or 15(d)

Common Stock (Narrative) (Details)

v3.21.2
Common Stock (Narrative) (Details) - Class A Common Stock [Member] - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 03, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jul. 21, 2021
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted 1,531,561 468,439          
Aggregate fair value $ 9.7   $ 9.7   $ 9.7    
Compensation cost     0.2   0.2    
Unamortized share-based compensation expense $ 9.5   $ 9.5   $ 9.5    
Antidilutive securities     58,555 1,016,981 58,555 1,016,981  
Restricted Stock [Member] | Share-based Payment Arrangement, Tranche One [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted         275,939    
Awards vesting period         4 years    
Restricted Stock [Member] | Share-based Payment Arrangement, Tranche Two [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Number of shares granted         192,500    
Awards vesting period         10 years    
Subsequent Event [Member]              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares authorized             2,000,000