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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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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

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