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Borrowings - Partnership's Borrowings (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Borrowing Outstanding $ 2,164.4 $ 2,306.7
Carrying Value 2,143.5 2,281.0
CLO Term Loans    
Debt Instrument [Line Items]    
Borrowing Outstanding 289.4 431.7
Carrying Value 288.0 426.4
3.500% Senior Notes Due 9/19/2029    
Debt Instrument [Line Items]    
Borrowing Outstanding 425.0 425.0
Carrying Value $ 422.9 422.5
Interest rate 3.50%  
5.625% Senior Notes Due 3/30/2043    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 600.0 600.0
Carrying Value $ 600.5 600.6
Interest rate 5.625%  
5.650% Senior Notes Due 9/15/2048    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 350.0 350.0
Carrying Value $ 346.6 346.4
Interest rate 5.65%  
4.625% Subordinated Notes Due 5/15/2061    
Debt Instrument [Line Items]    
Borrowing Outstanding $ 500.0 500.0
Carrying Value $ 485.5 $ 485.1
Interest rate 4.625%