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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Statement of Financial Position [Abstract] |  |
Accounts and accrued income receivable, allowances | $ 22.8 | $ 21.8
Pledged securities included in debt securities | 98.5 | 107.0
Debt securities, amortized cost | $ 7,256.7 | $ 7,895.2
Preferred stock, par value | $ 0.00001 | $ 0.00001
Preferred stock, shares authorized | 0.5 | 0.5
Preferred stock, outstanding | 0.0 | 0.0
Common stock, par value | $ 0.00001 | $ 0.00001
Common stock, shares authorized | 300.0 | 300.0
Common stock, shares outstanding | 103.0 | 103.1

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