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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2020
Dec. 31, 2019
Sep. 30, 2019
Fixed maturities, amortized cost $ 35,082.8 $ 32,643.1 $ 32,134.9
Nonredeemable preferred stocks, cost 1,302.7 971.3 1,054.2
Common equities, cost 1,130.0 1,125.5 1,210.3
Short-term investments, amortized cost 4,667.8 1,798.8 1,467.4
Premiums receivable, allowance for doubtful accounts 313.2 283.2 258.8
Intangible Assets, Accumulated Amortization 312.0 314.0 299.4
Property and equipment, accumulated depreciation $ 1,264.5 $ 1,138.1 $ 1,085.3
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) 797,500,000 797,500,000 797,500,000
Common Shares, treasury shares (shares) 211,900,000 212,900,000 212,900,000
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, No Par Value $ 0 $ 0 $ 0
Preferred Stock, Shares Authorized (shares) 500,000 500,000 500,000
Preferred Stock, Shares Issued (shares) 500,000 500,000 500,000
Preferred Stock, Shares Outstanding (shares) 500,000 500,000 500,000
Preferred Stock, Liquidation Preference Per Share (USD per share) $ 1,000.0 $ 1,000 $ 1,000