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Share-Based Compensation and Retirement Benefits - Weighted Average Assumptions (Details) - Employee Stock Option
12 Months Ended
Dec. 31, 2023
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Expected annual dividend yield 0.00%
Expected term (years) 6 years 6 months
Minimum  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Expected unit price volatility 65.00%
Risk-free interest rate 2.90%
Maximum  
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]  
Expected unit price volatility 70.00%
Risk-free interest rate 3.60%