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Financial Instruments and Fair Value Measurements - (Details) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Apr. 30, 2024
Feb. 29, 2024
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value by Fair Value Hierarchy Level [Line Items]                
Investment     $ 78.9     $ 78.9    
Unfunded commitments     22.2     22.2    
Capital contributions     0.7     19.0    
Unrealized gain (loss) on investments     0.0   $ 2.3 0.0 $ 7.3  
Investment in equity securities     68.1     $ 68.1   $ 10.1
Payments to acquire equity securities       $ 8.0        
Series C Preferred Stock                
Fair Value by Fair Value Hierarchy Level [Line Items]                
Investment in equity securities   $ 50.0            
Payments to acquire equity securities $ 40.0 $ 10.0            
Minimum                
Fair Value by Fair Value Hierarchy Level [Line Items]                
Investment fund, term           7 years    
Investment fund, option to extend, term           2 years    
Maximum                
Fair Value by Fair Value Hierarchy Level [Line Items]                
Investment fund, term           10 years    
Investment fund, option to extend, term           3 years    
Fair Value Measured at Net Asset Value Per Share                
Fair Value by Fair Value Hierarchy Level [Line Items]                
Equity securities without readily determinable fair value     $ 78.9     $ 78.9   $ 56.7