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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($)
shares in Millions, $ in Millions
Sep. 30, 2025
Dec. 31, 2024
Statement of Financial Position [Abstract]    
Accounts and accrued income receivable, allowances $ 23.7 $ 21.5
Pledged securities included in debt securities 164.2 92.4
Debt securities, amortized cost $ 8,469.8 $ 7,730.9
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 101.9 103.0