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Consolidated Balance Sheets (Parenthetical) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Statement of Financial Position [Abstract]    
Fixed maturities, amortized cost $ 20,209.9 $ 16,287.1
Nonredeemable preferred stocks, cost 698.6 734.2
Common equities, cost 1,499.0 1,437.5
Short Term Investments Amortized Cost 2,869.4 3,572.9
Premiums receivable, allowance for doubtful accounts 210.9 186.8
Reinsurance recoverables, paid losses and loss adjustment expenses 103.3 83.8
Property and equipment, accumulated depreciation 940.6 845.8
Finite-Lived Intangible Assets, Accumulated Amortization $ 175.7 $ 109.5
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) 215,800,000 217,600,000