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Supplemental Financial Data - Property, Plant and Equipment - Net (Details) - USD ($)
$ in Millions
1 Months Ended 12 Months Ended
Feb. 07, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Property, Plant and Equipment [Line Items]        
Less: Accumulated depreciation   $ 14.0 $ 7.5  
Property, plant and equipment - net less leasehold improvements   15.1 18.0  
Property, plant and equipment - net   26.4 29.4  
Depreciation $ 1.1 9.4 8.2 $ 10.9
Asset impairment charges   3.6 3.6  
Furniture        
Property, Plant and Equipment [Line Items]        
Furniture   24.3 22.4  
Property, Plant and Equipment, excluding Leasehold Improvements        
Property, Plant and Equipment [Line Items]        
Less: Accumulated depreciation   9.2 4.4  
Leasehold Improvements        
Property, Plant and Equipment [Line Items]        
Less: Accumulated depreciation   4.8 3.1  
Property, plant and equipment - net   $ 11.3 $ 11.4