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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