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SCHEDULE II - Condensed Financial Information of Registrant (Parent Company) - Statement of Cash Flows (Details) - USD ($) $ in Millions | 12 Months Ended
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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

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