Fair Value Measurements - Quantitative Information about Level 3 Fair Value (Details) - Significant unobservable inputs (Level 3) - Measurement Input, Option Volatility	Sep. 30, 2021
Fourth quarter 2021 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.22
Fourth quarter 2021 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.37
Fourth quarter 2021 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.30
2022 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.30
2022 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.43
2022 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.35
2023 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.28
2023 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.34
2023 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.31
2024 | Minimum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.26
2024 | Maximum
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.31
2024 | Weighted Average
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative asset, measurement input (in years)	0.28