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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Fixed maturities, amortized cost $ 32,134.9 $ 28,255.9 $ 25,963.4
Nonredeemable preferred stocks, cost 1,054.2 1,002.6 758.9
Common equities, cost 1,210.3 1,148.9 1,135.0
Short-term investments, amortized cost 1,467.4 1,795.9 2,809.7
Premiums receivable, allowance for doubtful accounts 258.8 252.1 230.1
Intangible Assets, Accumulated Amortization 299.4 247.7 229.7
Property and equipment, accumulated depreciation $ 1,085.3 $ 1,033.2 $ 1,004.6
Common Shares, par value (USD per share) $ 1.00 $ 1.00 $ 1.00
Common Shares, authorized (shares) 900,000,000 900,000,000.0 900,000,000
Common Shares, issued (shares) 797,500,000 797,500,000 797,500,000
Common Shares, treasury shares (shares) 212,900,000 214,300,000 214,400,000
Serial Preferred Stock      
Preferred Stock, Shares Authorized (shares) 20,000,000 20,000,000 20,000,000
Series B Preferred Stock | Serial Preferred Stock      
Preferred Stock, No Par Value $ 0 $ 0 $ 0
Preferred Stock, Shares Authorized (shares) 500,000.0 500,000.0 500,000.0
Preferred Stock, Shares Issued (shares) 500,000.0 500,000.0 500,000.0
Preferred Stock, Shares Outstanding (shares) 500,000.0 500,000.0 500,000.0
Preferred Stock, Liquidation Preference Per Share (USD per share) $ 1,000 $ 1,000 $ 1,000