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Amortized Cost or Cost and Fair Value of Available For Sale Securities (Detail) (USD $)
In Millions, unless otherwise specified

Sep. 30, 2012

Dec. 31, 2011

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

$ 17,601.8

$ 4,411.2

Gross Unrealized Gains

522.8

268.2

Gross Unrealized Losses

(48.4)

(32.4)

18,076.2

4,647.0

Equity Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

1,457.8

775.8

Gross Unrealized Gains

86.8

121.4

Gross Unrealized Losses

(40.0)

(26.2)

1,504.6

871.0

Equity Securities | Common Stock

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

1,457.8

^[1]

775.8

^[1]

Gross Unrealized Gains

86.8

^[1]

121.4

^[1]

Gross Unrealized Losses

(40.0)

^[1]

(26.2)

^[1]

1,504.6

^[1]

871.0

^[1]

Debt Securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

15,908.9

2,538.9

Gross Unrealized Gains

436.0

146.8

Gross Unrealized Losses

(8.4)

(6.2)

16,336.5

2,679.5

Debt Securities | U.S. Government obligations

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

476.0

260.6

Gross Unrealized Gains

10.3

7.2

Gross Unrealized Losses

(0.1)

486.2

267.8

Debt Securities | Municipal bonds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

6,380.4

1,038.2

Gross Unrealized Gains

185.5

75.7

Gross Unrealized Losses

(2.0)

(0.3)

6,563.9

1,113.6

Debt Securities | Foreign government obligations

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

821.9

Gross Unrealized Gains

16.5

838.4

Debt Securities | U.S. corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

3,445.3

341.8

Gross Unrealized Gains

71.9

14.4

Gross Unrealized Losses

(0.4)

(2.1)

3,516.8

354.1

Debt Securities | Foreign corporate bonds

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

2,150.7

81.8

Gross Unrealized Gains

53.4

2.2

Gross Unrealized Losses

(0.4)

(0.5)

2,203.7

83.5

Debt Securities | Mortgage and asset backed securities | RMBS

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

1,911.1

467.7

Gross Unrealized Gains

68.6

31.0

Gross Unrealized Losses

(3.8)

(1.4)

1,975.9

^[2]

497.3

^[2]

Debt Securities | Mortgage and asset backed securities | CMBS

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

471.0

133.5

Gross Unrealized Gains

24.6

13.0

Gross Unrealized Losses

(1.7)

(1.8)

493.9

144.7

Debt Securities | Mortgage and asset backed securities | Other asset-backed securities

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

252.5

215.3

Gross Unrealized Gains

5.2

3.3

Gross Unrealized Losses

(0.1)

257.7

218.5

Short-term Investments

Schedule of Available-for-sale Securities [Line Items]

Amortized Cost or Cost

235.1

1,096.5

$ 235.1

$ 1,096.5

[1]	Of the $1,504.6 million and $871.0 million of fair value as of September 30, 2012 and December 31, 2011, respectively, $572.8 million and $573.3 million, respectively, related to certain energy sector businesses.
[2]	Includes government agency pass-through securities guaranteed by a government agency or government sponsored enterprise, among other types of RMBS.

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This item represents the gross unrealized gains for securities, at a point in time, which are categorized neither as held-to-maturity nor trading securities.

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