Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Schedule of Qualitative Information) (Details)

v3.20.4
Fair Value Measurements (Schedule of Qualitative Information) (Details) - item
3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Minimum [Member] | Estimated Change Of Control Dates [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control date Dec. 01, 2021 Dec. 01, 2021
Minimum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 9.9 14.1
Minimum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 20 20
Maximum [Member] | Estimated Change Of Control Dates [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Estimated change of control date Jun. 01, 2022 Jun. 01, 2022
Maximum [Member] | Discount Rate [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 10.8 16.0
Maximum [Member] | Probability Of Change Of Control [Member]    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Significant unobservable input 90 90