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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Fixed maturities, amortized cost $ 32,643.1 $ 28,255.9
Nonredeemable preferred stocks, cost 971.3 1,002.6
Equity Securities Common Equities Cost 1,125.5 1,148.9
Debt Securities, Available-for-Sale Short Term Investments, Amortized Cost 1,798.8 1,795.9
Premiums receivable, allowance for doubtful accounts 283.2 252.1
Property and equipment, accumulated depreciation 1,138.1 1,033.2
Finite-Lived Intangible Assets, Accumulated Amortization $ 314.0 $ 247.7
Common Shares, par value (USD per share) $ 1.00 $ 1.00
Common Shares, authorized (shares) 900,000,000.0 900,000,000.0
Common Shares, issued (shares) 797,500,000 797,500,000
Common Shares, treasury shares (shares) 212,900,000 214,300,000
Serial Preferred Stock    
Preferred Stock, Shares Authorized 20,000,000 20,000,000
Series B Preferred Stock | Serial Preferred Stock    
Preferred Stock, No Par Value $ 0 $ 0
Preferred Stock, Shares Authorized 500,000.0 500,000.0
Preferred Stock, Shares Issued 500,000.0 500,000.0
Preferred Stock, Shares Outstanding 500,000.0 500,000.0
Preferred Stock, Liquidation Preference Per Share $ 1,000 $ 1,000