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SCHEDULE II - Condensed Financial Information of Registrant (Parent Company) - Statement of Cash Flows (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities: $ 627.7 $ 582.9 $ 495.4
Cash flows from investing activities:      
Sales of investments 3,240.2 1,388.6 3,253.6
Purchases of investments (6,803.0) (3,591.9) (6,482.0)
Net cash used by investing activities (1,488.6) (872.3) (1,781.3)
Cash flows from financing activities:      
Issuance of notes payable, net 691.0 0.0 0.0
Issuance of common stock 7.2 9.2 10.4
Payments to repurchase common stock (300.2) (166.1) (190.1)
Net cash provided by financing activities 1,969.6 533.5 1,199.1
Net increase (decrease) in cash and cash equivalents 1,108.7 244.1 (86.8)
Cash and cash equivalents - unrestricted and held by variable interest entities, beginning of year 889.0 644.9 731.7
Cash and cash equivalents - unrestricted and held by variable interest entities, end of year 1,997.7 889.0 644.9
Parent Company      
Condensed Financial Statements, Captions [Line Items]      
Cash flows from operating activities: (65.1) (106.8) (143.2)
Cash flows from investing activities:      
Sales of investments 0.0 43.2 24.6
Purchases of investments (499.8) (6.5) (11.8)
Net sales of trading securities 5.0 6.6 7.7
Dividends received from consolidated subsidiary [1] 0.0 150.0 69.6
Net cash used by investing activities (494.8) 193.3 90.1
Cash flows from financing activities:      
Issuance of notes payable, net 691.0 0.0 0.0
Issuance of common stock 11.1 13.2 13.5
Payments to repurchase common stock (300.2) (166.1) (190.1)
Common stock dividends paid (67.7) (68.1) (64.8)
Issuance of notes payable to affiliates [1] 419.1 400.3 349.5
Payments on notes payable to affiliates [1] (92.9) (147.2) (114.5)
Net cash provided by financing activities 660.4 32.1 (6.4)
Net increase (decrease) in cash and cash equivalents 100.5 118.6 (59.5)
Cash and cash equivalents - unrestricted and held by variable interest entities, beginning of year 255.3 136.7 196.2
Cash and cash equivalents - unrestricted and held by variable interest entities, end of year $ 355.8 $ 255.3 $ 136.7
[1] Eliminated in consolidation