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Fair Value Composition of Investment Portfolio by Major Security Type (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value Measurements [Line Items]    
Portfolio $ 18,054.7 [1],[2] $ 16,475.5 [1],[2]
Debt 2,073.7 2,394.4
Fixed maturities
    
Fair Value Measurements [Line Items]    
Portfolio 13,540.4 11,774.1
Fixed maturities | Redeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 313.9 374.7
Fixed maturities | Redeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 102.8 129.7
Fixed maturities | Redeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 65.6 66.7
Fixed maturities | Redeemable preferred stocks | Industrials
    
Fair Value Measurements [Line Items]    
Portfolio 145.5 178.3
Fixed maturities | Debt Securities
    
Fair Value Measurements [Line Items]    
Portfolio 8,860.4 7,973.9
Fixed maturities | Debt Securities | U.S. government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 3,662.2 2,896.5
Fixed maturities | Debt Securities | State and local government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 2,256.0 1,964.4
Fixed maturities | Debt Securities | Foreign government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 15.6 0
Fixed maturities | Debt Securities | Corporate debt securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,926.6 3,113.0
Fixed maturities | Asset-backed Securities
    
Fair Value Measurements [Line Items]    
Portfolio 4,366.1 3,425.5
Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,127.9 428.2
Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,160.5 2,048.7
Fixed maturities | Asset-backed Securities | Other asset-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,077.7 948.6
Equity securities | Nonredeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 711.2 812.4
Equity securities | Nonredeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 694.4 786.0
Equity securities | Nonredeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 16.8 26.4
Equity securities | Common equities
    
Fair Value Measurements [Line Items]    
Portfolio 2,530.5 1,899.0
Equity securities | Common equities | Common Stocks
    
Fair Value Measurements [Line Items]    
Portfolio 2,530.0 1,887.0
Equity securities | Common equities | Other risk investments
    
Fair Value Measurements [Line Items]    
Portfolio 0.5 12.0
Total Fixed Maturities and Equity Securities
    
Fair Value Measurements [Line Items]    
Portfolio 16,782.1 14,485.5
Short-term investments
    
Fair Value Measurements [Line Items]    
Portfolio 1,272.6 1,990.0
Fair Value, Inputs, Level 1
    
Fair Value Measurements [Line Items]    
Portfolio 7,436.4 6,723.0
Debt 0 0
Fair Value, Inputs, Level 1 | Fixed maturities
    
Fair Value Measurements [Line Items]    
Portfolio 3,677.8 2,896.5
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Industrials
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities
    
Fair Value Measurements [Line Items]    
Portfolio 3,677.8 2,896.5
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | U.S. government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 3,662.2 2,896.5
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | State and local government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Foreign government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 15.6 0
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Corporate debt securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 240.8 259.6
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 240.8 259.6
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Equity securities | Common equities
    
Fair Value Measurements [Line Items]    
Portfolio 2,530.0 1,887.0
Fair Value, Inputs, Level 1 | Equity securities | Common equities | Common Stocks
    
Fair Value Measurements [Line Items]    
Portfolio 2,530.0 1,887.0
Fair Value, Inputs, Level 1 | Equity securities | Common equities | Other risk investments
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 1 | Total Fixed Maturities and Equity Securities
    
Fair Value Measurements [Line Items]    
Portfolio 6,448.6 5,043.1
Fair Value, Inputs, Level 1 | Short-term investments
    
Fair Value Measurements [Line Items]    
Portfolio 987.8 1,679.9
Fair Value, Inputs, Level 2
    
Fair Value Measurements [Line Items]    
Portfolio 10,549.6 9,637.8
Debt 2,073.7 2,394.4
Fair Value, Inputs, Level 2 | Fixed maturities
    
Fair Value Measurements [Line Items]    
Portfolio 9,833.4 8,806.8
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 313.9 374.7
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 102.8 129.7
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 65.6 66.7
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Industrials
    
Fair Value Measurements [Line Items]    
Portfolio 145.5 178.3
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities
    
Fair Value Measurements [Line Items]    
Portfolio 5,182.6 5,077.4
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | U.S. government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | State and local government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 2,256.0 1,964.4
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Foreign government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Corporate debt securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,926.6 3,113.0
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities
    
Fair Value Measurements [Line Items]    
Portfolio 4,336.9 3,354.7
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,127.7 382.7
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,131.5 2,023.4
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,077.7 948.6
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 431.4 520.9
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 414.6 494.5
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 16.8 26.4
Fair Value, Inputs, Level 2 | Equity securities | Common equities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 2 | Equity securities | Common equities | Common Stocks
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 2 | Equity securities | Common equities | Other risk investments
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 2 | Total Fixed Maturities and Equity Securities
    
Fair Value Measurements [Line Items]    
Portfolio 10,264.8 9,327.7
Fair Value, Inputs, Level 2 | Short-term investments
    
Fair Value Measurements [Line Items]    
Portfolio 284.8 310.1
Fair Value, Inputs, Level 3
    
Fair Value Measurements [Line Items]    
Portfolio 68.7 114.7
Debt 0 0
Fair Value, Inputs, Level 3 | Fixed maturities
    
Fair Value Measurements [Line Items]    
Portfolio 29.2 70.8
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Industrials
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | U.S. government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | State and local government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Foreign government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Corporate debt securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities
    
Fair Value Measurements [Line Items]    
Portfolio 29.2 70.8
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 0.2 45.5
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 29.0 25.3
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 39.0 31.9
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 39.0 31.9
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Equity securities | Common equities
    
Fair Value Measurements [Line Items]    
Portfolio 0.5 12.0
Fair Value, Inputs, Level 3 | Equity securities | Common equities | Common Stocks
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Fair Value, Inputs, Level 3 | Equity securities | Common equities | Other risk investments
    
Fair Value Measurements [Line Items]    
Portfolio 0.5 12.0
Fair Value, Inputs, Level 3 | Total Fixed Maturities and Equity Securities
    
Fair Value Measurements [Line Items]    
Portfolio 68.7 114.7
Fair Value, Inputs, Level 3 | Short-term investments
    
Fair Value Measurements [Line Items]    
Portfolio 0 0
Carrying (Reported) Amount, Fair Value Disclosure
    
Fair Value Measurements [Line Items]    
Portfolio 16,584.7 15,138.2
Debt 1,860.9 2,063.1
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities
    
Fair Value Measurements [Line Items]    
Portfolio 13,415.3 11,373.9
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 299.5 356.9
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 84.2 110.7
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 64.9 64.9
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Industrials
    
Fair Value Measurements [Line Items]    
Portfolio 150.4 181.3
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities
    
Fair Value Measurements [Line Items]    
Portfolio 8,778.3 7,703.7
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | U.S. government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 3,630.4 2,806.4
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | State and local government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 2,247.3 1,914.4
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Foreign government obligations
    
Fair Value Measurements [Line Items]    
Portfolio 15.6 0
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Corporate debt securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,885.0 2,982.9
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities
    
Fair Value Measurements [Line Items]    
Portfolio 4,337.5 3,313.3
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,110.1 413.4
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 2,154.4 1,963.9
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Other asset-backed securities
    
Fair Value Measurements [Line Items]    
Portfolio 1,073.0 936.0
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks
    
Fair Value Measurements [Line Items]    
Portfolio 445.7 404.0
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Financials
    
Fair Value Measurements [Line Items]    
Portfolio 431.5 383.3
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Utilities
    
Fair Value Measurements [Line Items]    
Portfolio 14.2 20.7
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities
    
Fair Value Measurements [Line Items]    
Portfolio 1,451.1 1,370.3
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Common Stocks
    
Fair Value Measurements [Line Items]    
Portfolio 1,450.6 1,367.2
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Other risk investments
    
Fair Value Measurements [Line Items]    
Portfolio 0.5 3.1
Carrying (Reported) Amount, Fair Value Disclosure | Total Fixed Maturities and Equity Securities
    
Fair Value Measurements [Line Items]    
Portfolio 15,312.1 13,148.2
Carrying (Reported) Amount, Fair Value Disclosure | Short-term investments
    
Fair Value Measurements [Line Items]    
Portfolio $ 1,272.6 $ 1,990.0
[1] The total fair value of the portfolio included $1.8 billion and $1.4 billion at December 31, 2013 and 2012, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.
[2] Reflected in our total portfolio are unsettled security transactions and collateral on open derivative positions, which collectively reflect a liability of $61.3 million at December 31, 2013, compared to an asset of $90.9 million at December 31, 2012.