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v3.23.3

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Sep. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022
--- | --- | --- | ---
Common shares, par value (USD per share) | $ 1.00 | $ 1.00 | $ 1.00
Common shares, authorized (shares) | 900,000,000.0 | 900,000,000.0 | 900,000,000.0
Common shares, issued (shares) | 797,600,000 | 797,600,000 | 797,600,000
Treasury shares | 212,600,000 | 212,700,000 | 212,500,000
Fixed maturities, amortized cost | $ 60,490.6 | $ 50,264.0 | $ 48,205.7
Short-term investments, amortized cost | 1,795.2 | 2,861.7 | 4,237.6
Nonredeemable preferred stocks, cost | 976.9 | 1,364.2 | 1,417.6
Common equities, cost | 662.6 | 826.1 | 803.7
Premium receivable, allowance for credit loss | 361.2 | 343.3 | 295.0
Property and equipment, accumulated depreciation | 1,596.9 | 1,551.1 | 1,499.0
Intangible assets, accumulated amortization | $ 170.0 | $ 158.6 | $ 153.1
Serial Preferred Stock |  |  |
Preferred stock, shares authorized (shares) | 20,000,000.0 | 20,000,000.0 | 20,000,000.0
Series B Preferred Stock | Serial Preferred Stock |  |  |
Preferred stock, shares authorized (shares) | 500,000 | 500,000 | 500,000
Preferred stock, no par value | $ 0 | $ 0 | $ 0
Preferred stock, liquidation preference per share (USD per share) | $ 1,000 | $ 1,000 | $ 1,000
Preferred stock, shares issued (shares) | 500,000 | 500,000 | 500,000
Preferred stock, shares outstanding (shares) | 500,000 | 500,000 | 500,000

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