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Fair Value Composition of Investment Portfolio by Major Security Type (Detail) (USD $)
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Fair Value Measurements [Line Items]      
Portfolio $ 18,759,200,000 [1],[2] $ 18,054,700,000 [1],[2] $ 17,486,400,000 [1],[2]
Debt 2,551,600,000 2,073,700,000 2,300,800,000
Fixed maturities
      
Fair Value Measurements [Line Items]      
Portfolio 12,498,600,000 13,540,400,000 12,949,400,000
Fixed maturities | Redeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 287,500,000 313,900,000 374,100,000
Fixed maturities | Redeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 103,400,000 102,800,000 132,600,000
Fixed maturities | Redeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 65,300,000 65,600,000 66,400,000
Fixed maturities | Redeemable preferred stocks | Industrials
      
Fair Value Measurements [Line Items]      
Portfolio 118,800,000 145,500,000 175,100,000
Fixed maturities | Debt Securities
      
Fair Value Measurements [Line Items]      
Portfolio 7,883,400,000 8,860,400,000 8,519,100,000
Fixed maturities | Debt Securities | U.S. government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 3,289,400,000 3,662,200,000 3,410,800,000
Fixed maturities | Debt Securities | State and local government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 2,331,200,000 2,256,000,000 2,019,900,000
Fixed maturities | Debt Securities | Foreign government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 15,600,000 16,400,000
Fixed maturities | Debt Securities | Corporate debt securities
      
Fair Value Measurements [Line Items]      
Portfolio 2,262,800,000 2,926,600,000 3,072,000,000
Fixed maturities | Asset-backed Securities
      
Fair Value Measurements [Line Items]      
Portfolio 4,327,700,000 4,366,100,000 4,056,200,000
Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 1,335,400,000 1,127,900,000 886,700,000
Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 2,019,300,000 2,160,500,000 2,221,800,000
Fixed maturities | Asset-backed Securities | Other asset-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 973,000,000 1,077,700,000 947,700,000
Equity securities | Nonredeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 760,200,000 711,200,000 754,400,000
Equity securities | Nonredeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 760,200,000 694,400,000 737,600,000
Equity securities | Nonredeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 16,800,000 16,800,000
Equity securities | Common equities
      
Fair Value Measurements [Line Items]      
Portfolio 2,381,700,000 2,530,500,000 2,224,500,000
Equity securities | Common equities | Common Stocks
      
Fair Value Measurements [Line Items]      
Portfolio 2,381,200,000 2,530,000,000 2,185,800,000
Equity securities | Common equities | Other risk investments
      
Fair Value Measurements [Line Items]      
Portfolio 500,000 500,000 38,700,000
Total Fixed Maturities and Equity Securities
      
Fair Value Measurements [Line Items]      
Portfolio 15,640,500,000 16,782,100,000 15,928,300,000
Short-term investments
      
Fair Value Measurements [Line Items]      
Portfolio 3,118,700,000 1,272,600,000 1,558,100,000
Fair Value, Inputs, Level 1
      
Fair Value Measurements [Line Items]      
Portfolio 8,752,600,000 7,436,400,000 6,987,400,000
Debt 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities
      
Fair Value Measurements [Line Items]      
Portfolio 3,289,400,000 3,677,800,000 3,427,200,000
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Industrials
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities
      
Fair Value Measurements [Line Items]      
Portfolio 3,289,400,000 3,677,800,000 3,427,200,000
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | U.S. government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 3,289,400,000 3,662,200,000 3,410,800,000
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | State and local government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Foreign government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 15,600,000 16,400,000
Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Corporate debt securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 238,700,000 240,800,000 256,600,000
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 238,700,000 240,800,000 256,600,000
Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Equity securities | Common equities
      
Fair Value Measurements [Line Items]      
Portfolio 2,381,200,000 2,530,000,000 2,185,800,000
Fair Value, Inputs, Level 1 | Equity securities | Common equities | Common Stocks
      
Fair Value Measurements [Line Items]      
Portfolio 2,381,200,000 2,530,000,000 2,185,800,000
Fair Value, Inputs, Level 1 | Equity securities | Common equities | Other risk investments
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 1 | Total Fixed Maturities and Equity Securities
      
Fair Value Measurements [Line Items]      
Portfolio 5,909,300,000 6,448,600,000 5,869,600,000
Fair Value, Inputs, Level 1 | Short-term investments
      
Fair Value Measurements [Line Items]      
Portfolio 2,843,300,000 987,800,000 1,117,800,000
Fair Value, Inputs, Level 2
      
Fair Value Measurements [Line Items]      
Portfolio 9,934,700,000 10,549,600,000 10,240,800,000
Debt 2,551,600,000 2,073,700,000 2,300,800,000
Fair Value, Inputs, Level 2 | Fixed maturities
      
Fair Value Measurements [Line Items]      
Portfolio 9,181,600,000 9,833,400,000 9,337,500,000
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 287,500,000 313,900,000 374,100,000
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 103,400,000 102,800,000 132,600,000
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 65,300,000 65,600,000 66,400,000
Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Industrials
      
Fair Value Measurements [Line Items]      
Portfolio 118,800,000 145,500,000 175,100,000
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities
      
Fair Value Measurements [Line Items]      
Portfolio 4,594,000,000 5,182,600,000 5,091,900,000
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | U.S. government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | State and local government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 2,331,200,000 2,256,000,000 2,019,900,000
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Foreign government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Corporate debt securities
      
Fair Value Measurements [Line Items]      
Portfolio 2,262,800,000 2,926,600,000 3,072,000,000
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities
      
Fair Value Measurements [Line Items]      
Portfolio 4,300,100,000 4,336,900,000 3,871,500,000
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 1,335,400,000 1,127,700,000 729,600,000
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 1,991,700,000 2,131,500,000 2,194,200,000
Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 973,000,000 1,077,700,000 947,700,000
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 477,700,000 431,400,000 463,000,000
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 477,700,000 414,600,000 446,200,000
Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 16,800,000 16,800,000
Fair Value, Inputs, Level 2 | Equity securities | Common equities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 2 | Equity securities | Common equities | Common Stocks
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 2 | Equity securities | Common equities | Other risk investments
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 2 | Total Fixed Maturities and Equity Securities
      
Fair Value Measurements [Line Items]      
Portfolio 9,659,300,000 10,264,800,000 9,800,500,000
Fair Value, Inputs, Level 2 | Short-term investments
      
Fair Value Measurements [Line Items]      
Portfolio 275,400,000 284,800,000 440,300,000
Fair Value, Inputs, Level 3
      
Fair Value Measurements [Line Items]      
Portfolio 71,900,000 68,700,000 258,200,000
Debt 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities
      
Fair Value Measurements [Line Items]      
Portfolio 27,600,000 29,200,000 184,700,000
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Industrials
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | U.S. government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | State and local government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Foreign government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Corporate debt securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities
      
Fair Value Measurements [Line Items]      
Portfolio 27,600,000 29,200,000 184,700,000
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 200,000 157,100,000
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 27,600,000 29,000,000 27,600,000
Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Other asset-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 43,800,000 39,000,000 34,800,000
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 43,800,000 39,000,000 34,800,000
Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Equity securities | Common equities
      
Fair Value Measurements [Line Items]      
Portfolio 500,000 500,000 38,700,000
Fair Value, Inputs, Level 3 | Equity securities | Common equities | Common Stocks
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Fair Value, Inputs, Level 3 | Equity securities | Common equities | Other risk investments
      
Fair Value Measurements [Line Items]      
Portfolio 500,000 500,000 38,700,000
Fair Value, Inputs, Level 3 | Total Fixed Maturities and Equity Securities
      
Fair Value Measurements [Line Items]      
Portfolio 71,900,000 68,700,000 258,200,000
Fair Value, Inputs, Level 3 | Short-term investments
      
Fair Value Measurements [Line Items]      
Portfolio 0 0 0
Carrying (Reported) Amount, Fair Value Disclosure
      
Fair Value Measurements [Line Items]      
Portfolio 17,146,400,000 16,584,700,000 16,237,200,000
Debt 2,208,000,000 1,860,900,000 2,063,900,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities
      
Fair Value Measurements [Line Items]      
Portfolio 12,265,400,000 13,415,300,000 12,824,100,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 262,000,000 299,500,000 359,000,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 79,200,000 84,200,000 113,700,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 65,000,000 64,900,000 64,900,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Industrials
      
Fair Value Measurements [Line Items]      
Portfolio 117,800,000 150,400,000 180,400,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities
      
Fair Value Measurements [Line Items]      
Portfolio 7,751,600,000 8,778,300,000 8,438,600,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | U.S. government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 3,249,000,000 3,630,400,000 3,362,800,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | State and local government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 2,287,200,000 2,247,300,000 2,010,600,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Foreign government obligations
      
Fair Value Measurements [Line Items]      
Portfolio 0 15,600,000 16,400,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Corporate debt securities
      
Fair Value Measurements [Line Items]      
Portfolio 2,215,400,000 2,885,000,000 3,048,800,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities
      
Fair Value Measurements [Line Items]      
Portfolio 4,251,800,000 4,337,500,000 4,026,500,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 1,312,000,000 1,110,100,000 870,900,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 1,974,400,000 2,154,400,000 2,213,900,000
Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Other asset-backed securities
      
Fair Value Measurements [Line Items]      
Portfolio 965,400,000 1,073,000,000 941,700,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks
      
Fair Value Measurements [Line Items]      
Portfolio 497,100,000 445,700,000 416,800,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Financials
      
Fair Value Measurements [Line Items]      
Portfolio 497,100,000 431,500,000 402,600,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Utilities
      
Fair Value Measurements [Line Items]      
Portfolio 0 14,200,000 14,200,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities
      
Fair Value Measurements [Line Items]      
Portfolio 1,265,200,000 1,451,100,000 1,438,200,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Common Stocks
      
Fair Value Measurements [Line Items]      
Portfolio 1,264,700,000 1,450,600,000 1,435,100,000
Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Other risk investments
      
Fair Value Measurements [Line Items]      
Portfolio 500,000 500,000 3,100,000
Carrying (Reported) Amount, Fair Value Disclosure | Total Fixed Maturities and Equity Securities
      
Fair Value Measurements [Line Items]      
Portfolio 14,027,700,000 15,312,100,000 14,679,100,000
Carrying (Reported) Amount, Fair Value Disclosure | Short-term investments
      
Fair Value Measurements [Line Items]      
Portfolio $ 3,118,700,000 $ 1,272,600,000 $ 1,558,100,000
[1] Our portfolio reflects the effect of unsettled security transactions and collateral on open derivative positions; at June 30, 2014, $235.8 million was included in "other liabilities," compared to $117.0 million and $61.3 million at June 30, 2013 and December 31, 2013, respectively.
[2] The total fair value of the portfolio at June 30, 2014 and 2013, and December 31, 2013 included $1.1 billion, $1.2 billion, and $1.8 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company, net of any unsettled security transactions.