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Borrowings - Schedule of Debt Obligations (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024	Jun. 30, 2021	May 31, 2021
Debt Instrument [Line Items]
Borrowing Outstanding	$ 3,014,300,000	$ 2,164,400,000
Carrying Value	2,984,200,000	2,143,500,000
CLO Borrowings
Debt Instrument [Line Items]
Borrowing Outstanding	339,300,000	289,400,000
Carrying Value	$ 337,000,000.0	288,000,000.0
3.500% Senior Notes Due 9/19/2029
Debt Instrument [Line Items]
Interest rate (percent)	3.50%
Borrowing Outstanding	$ 425,000,000.0	425,000,000.0
Carrying Value	$ 423,200,000	422,900,000
5.050% Senior Notes Due 9/19/2035
Debt Instrument [Line Items]
Interest rate (percent)	5.05%
Borrowing Outstanding	$ 800,000,000.0	0
Carrying Value	$ 791,000,000.0	0
5.625% Senior Notes Due 3/30/2043
Debt Instrument [Line Items]
Interest rate (percent)	5.625%
Borrowing Outstanding	$ 600,000,000.0	600,000,000.0
Carrying Value	$ 600,500,000	600,500,000
5.650% Senior Notes Due 9/15/2048
Debt Instrument [Line Items]
Interest rate (percent)	5.65%
Borrowing Outstanding	$ 350,000,000.0	350,000,000.0
Carrying Value	$ 346,700,000	346,600,000
4.625% Subordinated Notes Due 5/15/2061
Debt Instrument [Line Items]
Interest rate (percent)	4.625%			4.625%
Borrowing Outstanding	$ 500,000,000.0	500,000,000.0	$ 65,000,000	$ 435,000,000
Carrying Value	$ 485,800,000	$ 485,500,000