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Income Taxes - Textual (Details) - USD ($)
$ in Millions
 10 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Dec. 31, 2018
Mar. 31, 2018
Jan. 01, 2018
Valuation Allowance [Line Items]              
Changes to valuation allowance during the period   $ 7.8 $ 4.7        
Remaining valuation allowance   46.2 38.4        
Deferred tax liability and additional cash tax benefits $ 51.3 0.0          
Unrecognized tax benefits, decrease resulting from current period tax positions 33.7            
Deferred tax liabilities, deferred expense, reserves and accruals           $ 23.6  
Deferred revenue, additions       $ 22.2      
Unrecognized income tax benefits $ 0.3 0.2 $ 0.4   $ 0.9   $ 0.3
Decrease in unrecognized tax benefits is reasonably possible   0.2          
State              
Valuation Allowance [Line Items]              
Net operating loss   $ 57.6