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Income Taxes - Reconciliation of Liability for Unrecognized Tax Benefits (Details) - USD ($)
$ in Millions
 10 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Gross Unrecognized Income Tax Benefits        
Gross unrecognized income tax benefits, Beginning Balance   $ 0.4 $ 0.9 $ 0.3
Gross amount of increases in unrecognized tax benefits related to prior periods       0.8
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations   (0.2) (0.5) (0.2)
Gross amount of increases in unrecognized tax benefits related to current period $ 51.3 0.0    
Gross unrecognized income tax benefits, Ending Balance 0.3 0.2 0.4 0.9
Accrued Interest and Penalties        
Unrecognized tax benefits, Accrued interest and penalties, Beginning Balance   0.1 0.1 0.0
Gross amount of increases in unrecognized tax benefits related to prior periods       0.1
Gross amount of increases in unrecognized tax benefits related to current period   0.1    
Reductions to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations   (0.2) 0.0 0.0
Unrecognized tax benefits, Accrued interest and penalties, Ending Balance $ 0.0 $ 0.0 $ 0.1 $ 0.1