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Composition of Investment Portfolio by Major Security Type (Detail) (USD $)
In Millions, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

Fair Value Measurements [Line Items]

$ 17,995.9

^[1],[2]

$ 16,475.5

^[1],[2]

$ 17,176.9

^[1],[2]

2,231.4

2,394.4

2,405.9

Fixed maturities

Fair Value Measurements [Line Items]

13,797.7

11,774.1

12,295.2

Fixed maturities | Redeemable preferred stocks

Fair Value Measurements [Line Items]

345.1

374.7

380.6

Fixed maturities | Redeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

134.2

129.7

133.9

Fixed maturities | Redeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

65.3

66.7

66.9

Fixed maturities | Redeemable preferred stocks | Industrials

Fair Value Measurements [Line Items]

145.6

178.3

179.8

Fixed maturities | Debt Securities

Fair Value Measurements [Line Items]

9,053.8

7,973.9

8,326.0

Fixed maturities | Debt Securities | U.S. government obligations

Fair Value Measurements [Line Items]

3,741.7

2,896.5

3,544.0

Fixed maturities | Debt Securities | State and local government obligations

Fair Value Measurements [Line Items]

2,138.6

1,964.4

1,959.5

Fixed maturities | Debt Securities | Foreign government obligations

Fair Value Measurements [Line Items]

15.9

0

0

Fixed maturities | Debt Securities | Corporate debt securities

Fair Value Measurements [Line Items]

3,157.6

3,113.0

2,822.5

Fixed maturities | Asset-backed Securities

Fair Value Measurements [Line Items]

4,398.8

3,425.5

3,588.6

Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities

Fair Value Measurements [Line Items]

1,009.9

428.2

408.7

Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities

Fair Value Measurements [Line Items]

2,240.0

2,048.7

2,087.6

Fixed maturities | Asset-backed Securities | Other asset-backed securities

Fair Value Measurements [Line Items]

1,148.9

948.6

1,092.3

Equity securities | Nonredeemable preferred stocks

Fair Value Measurements [Line Items]

726.0

812.4

848.4

Equity securities | Nonredeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

709.2

786.0

818.9

Equity securities | Nonredeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

16.8

26.4

29.5

Equity securities | Common equities

Fair Value Measurements [Line Items]

2,326.1

1,899.0

1,639.2

Equity securities | Common equities | Common Stocks

Fair Value Measurements [Line Items]

2,287.4

1,887.0

1,627.2

Equity securities | Common equities | Other risk investments

Fair Value Measurements [Line Items]

38.7

12.0

12.0

Total Fixed Maturities and Equity Securities

Fair Value Measurements [Line Items]

16,849.8

14,485.5

14,782.8

Short-term investments

Fair Value Measurements [Line Items]

1,146.1

1,990.0

2,394.1

Fair Value, Inputs, Level 1

Fair Value Measurements [Line Items]

7,040.5

6,723.0

7,557.1

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities

Fair Value Measurements [Line Items]

3,757.6

2,896.5

3,544.0

Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Redeemable preferred stocks | Industrials

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities

Fair Value Measurements [Line Items]

3,757.6

2,896.5

3,544.0

Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | U.S. government obligations

Fair Value Measurements [Line Items]

3,741.7

2,896.5

3,544.0

Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | State and local government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Foreign government obligations

Fair Value Measurements [Line Items]

15.9

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Debt Securities | Corporate debt securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Fixed maturities | Asset-backed Securities | Other asset-backed securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks

Fair Value Measurements [Line Items]

244.0

259.6

265.2

Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

244.0

259.6

265.2

Fair Value, Inputs, Level 1 | Equity securities | Nonredeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Equity securities | Common equities

Fair Value Measurements [Line Items]

2,287.4

1,887.0

1,627.2

Fair Value, Inputs, Level 1 | Equity securities | Common equities | Common Stocks

Fair Value Measurements [Line Items]

2,287.4

1,887.0

1,627.2

Fair Value, Inputs, Level 1 | Equity securities | Common equities | Other risk investments

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 1 | Total Fixed Maturities and Equity Securities

Fair Value Measurements [Line Items]

6,289.0

5,043.1

5,436.4

Fair Value, Inputs, Level 1 | Short-term investments

Fair Value Measurements [Line Items]

751.5

1,679.9

2,120.7

Fair Value, Inputs, Level 2

Fair Value Measurements [Line Items]

10,849.1

9,637.8

9,505.7

2,231.4

2,394.4

2,405.9

Fair Value, Inputs, Level 2 | Fixed maturities

Fair Value Measurements [Line Items]

10,008.6

8,806.8

8,678.4

Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks

Fair Value Measurements [Line Items]

345.1

374.7

380.6

Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

134.2

129.7

133.9

Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

65.3

66.7

66.9

Fair Value, Inputs, Level 2 | Fixed maturities | Redeemable preferred stocks | Industrials

Fair Value Measurements [Line Items]

145.6

178.3

179.8

Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities

Fair Value Measurements [Line Items]

5,296.2

5,077.4

4,782.0

Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | U.S. government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | State and local government obligations

Fair Value Measurements [Line Items]

2,138.6

1,964.4

1,959.5

Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Foreign government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 2 | Fixed maturities | Debt Securities | Corporate debt securities

Fair Value Measurements [Line Items]

3,157.6

3,113.0

2,822.5

Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities

Fair Value Measurements [Line Items]

4,367.3

3,354.7

3,515.8

Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities

Fair Value Measurements [Line Items]

1,009.7

382.7

358.8

Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities

Fair Value Measurements [Line Items]

2,208.7

2,023.4

2,065.0

Fair Value, Inputs, Level 2 | Fixed maturities | Asset-backed Securities | Other asset-backed securities

Fair Value Measurements [Line Items]

1,148.9

948.6

1,092.0

Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks

Fair Value Measurements [Line Items]

445.9

520.9

553.9

Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

429.1

494.5

524.4

Fair Value, Inputs, Level 2 | Equity securities | Nonredeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

16.8

26.4

29.5

Fair Value, Inputs, Level 2 | Equity securities | Common equities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 2 | Equity securities | Common equities | Common Stocks

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 2 | Equity securities | Common equities | Other risk investments

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 2 | Total Fixed Maturities and Equity Securities

Fair Value Measurements [Line Items]

10,454.5

9,327.7

9,232.3

Fair Value, Inputs, Level 2 | Short-term investments

Fair Value Measurements [Line Items]

394.6

310.1

273.4

Fair Value, Inputs, Level 3

Fair Value Measurements [Line Items]

106.3

114.7

114.1

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities

Fair Value Measurements [Line Items]

31.5

70.8

72.8

Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Redeemable preferred stocks | Industrials

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | U.S. government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | State and local government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Foreign government obligations

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Debt Securities | Corporate debt securities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities

Fair Value Measurements [Line Items]

31.5

70.8

72.8

Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities

Fair Value Measurements [Line Items]

0.2

45.5

49.9

Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities

Fair Value Measurements [Line Items]

31.3

25.3

22.6

Fair Value, Inputs, Level 3 | Fixed maturities | Asset-backed Securities | Other asset-backed securities

Fair Value Measurements [Line Items]

0

0

0.3

Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks

Fair Value Measurements [Line Items]

36.1

31.9

29.3

Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

36.1

31.9

29.3

Fair Value, Inputs, Level 3 | Equity securities | Nonredeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Equity securities | Common equities

Fair Value Measurements [Line Items]

38.7

12.0

12.0

Fair Value, Inputs, Level 3 | Equity securities | Common equities | Common Stocks

Fair Value Measurements [Line Items]

0

0

0

Fair Value, Inputs, Level 3 | Equity securities | Common equities | Other risk investments

Fair Value Measurements [Line Items]

38.7

12.0

12.0

Fair Value, Inputs, Level 3 | Total Fixed Maturities and Equity Securities

Fair Value Measurements [Line Items]

106.3

114.7

114.1

Fair Value, Inputs, Level 3 | Short-term investments

Fair Value Measurements [Line Items]

0

0

0

Carrying (Reported) Amount, Fair Value Disclosure

Fair Value Measurements [Line Items]

16,655.4

15,138.2

15,789.7

2,010.6

2,063.1

2,062.7

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities

Fair Value Measurements [Line Items]

13,644.9

11,373.9

11,864.0

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks

Fair Value Measurements [Line Items]

331.0

356.9

368.0

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

115.7

110.7

120.8

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

64.9

64.9

65.9

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Redeemable preferred stocks | Industrials

Fair Value Measurements [Line Items]

150.4

181.3

181.3

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities

Fair Value Measurements [Line Items]

8,951.6

7,703.7

8,020.4

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | U.S. government obligations

Fair Value Measurements [Line Items]

3,691.2

2,806.4

3,433.7

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | State and local government obligations

Fair Value Measurements [Line Items]

2,125.7

1,914.4

1,898.9

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Foreign government obligations

Fair Value Measurements [Line Items]

15.9

0

0

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Debt Securities | Corporate debt securities

Fair Value Measurements [Line Items]

3,118.8

2,982.9

2,687.8

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities

Fair Value Measurements [Line Items]

4,362.3

3,313.3

3,475.6

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Residential mortgage-backed securities

Fair Value Measurements [Line Items]

994.9

413.4

399.5

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Commercial mortgage-backed securities

Fair Value Measurements [Line Items]

2,224.1

1,963.9

1,998.2

Carrying (Reported) Amount, Fair Value Disclosure | Fixed maturities | Asset-backed Securities | Other asset-backed securities

Fair Value Measurements [Line Items]

1,143.3

936.0

1,077.9

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks

Fair Value Measurements [Line Items]

442.1

404.0

430.1

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Financials

Fair Value Measurements [Line Items]

427.9

383.3

407.3

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Nonredeemable preferred stocks | Utilities

Fair Value Measurements [Line Items]

14.2

20.7

22.8

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities

Fair Value Measurements [Line Items]

1,422.3

1,370.3

1,101.5

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Common Stocks

Fair Value Measurements [Line Items]

1,419.2

1,367.2

1,098.3

Carrying (Reported) Amount, Fair Value Disclosure | Equity securities | Common equities | Other risk investments

Fair Value Measurements [Line Items]

3.1

3.1

3.2

Carrying (Reported) Amount, Fair Value Disclosure | Total Fixed Maturities and Equity Securities

Fair Value Measurements [Line Items]

15,509.3

13,148.2

13,395.6

Carrying (Reported) Amount, Fair Value Disclosure | Short-term investments

Fair Value Measurements [Line Items]

$ 1,146.1

$ 1,990.0

$ 2,394.1

[1]	The total fair value of the portfolio at September 30, 2013 and 2012, and December 31, 2012 included $1.3 billion, $1.6 billion, and $1.4 billion, respectively, of securities held in a consolidated, non-insurance subsidiary of the holding company.
[2]	At September 30, 2013, we had $63.7 million of net unsettled security transactions, including collateral on open derivative positions, recognized in other liabilities, compared to $32.4 million and $90.9 million recognized in other assets at September 30, 2012 and December 31, 2012, respectively.