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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) shares in Millions, $ in Millions | Mar. 31, 2023 | Dec. 31, 2022
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Statement Of Financial Position [Abstract] |  |
Accounts and accrued income receivable, allowances | $ 20.6 | $ 21.3
Debt securities, amortized costs | 8,478.2 | 9,169.6
Pledged securities included in debt securities | $ 91.0 | $ 86.0
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 | 103.3 | 103.2

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