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Investments (Details 3) (USD $)	Sep. 30, 2012	Dec. 31, 2011
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 10,885,071,000	$ 6,931,958,000
Available For Sale Securities Gross Unrealized Losses	153,700,000	292,486,000
Available For Sale Securities Fair Value Disclosure	11,899,722,000	7,461,106,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	18,905,283,000	14,182,880,000
Available For Sale Securities Gross Unrealized Gain	2,905,997,000	2,300,036,000
Available For Sale Securities Gross Unrealized Losses	152,866,000	281,966,000
Available For Sale Securities Fair Value Disclosure	21,658,414,000	16,200,950,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(8,883,000)	(18,523,000)
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	202,219,000	117,840,000
Available For Sale Securities Gross Unrealized Gain	7,887,000	6,580,000
Available For Sale Securities Gross Unrealized Losses	834,000	10,520,000
Available For Sale Securities Fair Value Disclosure	209,272,000	113,900,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Corporate Debt Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	10,885,071,000	6,931,958,000
Available For Sale Securities Gross Unrealized Gain	1,059,275,000	654,519,000
Available For Sale Securities Gross Unrealized Losses	44,624,000	125,371,000
Available For Sale Securities Fair Value Disclosure	11,899,722,000	7,461,106,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	55.00%	46.00%
Canadian Provincial Governments [Member] | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,653,761,000	2,507,802,000
Available For Sale Securities Gross Unrealized Gain	1,438,124,000	1,362,160,000
Available For Sale Securities Gross Unrealized Losses	2,000	29,000
Available For Sale Securities Fair Value Disclosure	4,091,883,000	3,869,933,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	18.90%	23.90%
Residential Mortgage Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	980,655,000	1,167,265,000
Available For Sale Securities Gross Unrealized Gain	80,614,000	76,393,000
Available For Sale Securities Gross Unrealized Losses	5,461,000	16,424,000
Available For Sale Securities Fair Value Disclosure	1,055,808,000	1,227,234,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(477,000)	(1,042,000)
Percentage Of Total Available For Sale Securities	4.90%	7.60%
Asset Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	588,851,000	443,974,000
Available For Sale Securities Gross Unrealized Gain	18,050,000	11,692,000
Available For Sale Securities Gross Unrealized Losses	34,201,000	53,675,000
Available For Sale Securities Fair Value Disclosure	572,700,000	401,991,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(2,295,000)	(5,256,000)
Percentage Of Total Available For Sale Securities	2.60%	2.50%
Commercial Mortgage Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,663,493,000	1,233,958,000
Available For Sale Securities Gross Unrealized Gain	137,153,000	87,750,000
Available For Sale Securities Gross Unrealized Losses	60,255,000	79,489,000
Available For Sale Securities Fair Value Disclosure	1,740,391,000	1,242,219,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(6,111,000)	(12,225,000)
Percentage Of Total Available For Sale Securities	8.00%	7.70%
US Government And Government Agencies And Authorities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	251,417,000	341,087,000
Available For Sale Securities Gross Unrealized Gain	33,458,000	32,976,000
Available For Sale Securities Gross Unrealized Losses	18,000	61,000
Available For Sale Securities Fair Value Disclosure	284,857,000	374,002,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	1.30%	2.30%
US States And Political Subdivisions Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	254,845,000	184,308,000
Available For Sale Securities Gross Unrealized Gain	38,784,000	24,419,000
Available For Sale Securities Gross Unrealized Losses	6,212,000	3,341,000
Available For Sale Securities Fair Value Disclosure	287,417,000	205,386,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	1.30%	1.30%
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,627,190,000	1,372,528,000
Available For Sale Securities Gross Unrealized Gain	100,539,000	50,127,000
Available For Sale Securities Gross Unrealized Losses	2,093,000	3,576,000
Available For Sale Securities Fair Value Disclosure	1,725,636,000	1,419,079,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	8.00%	0.00%
Nonredeemable Preferred Stock Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	69,182,000	82,488,000
Available For Sale Securities Gross Unrealized Gain	6,332,000	4,677,000
Available For Sale Securities Gross Unrealized Losses	834,000	8,982,000
Available For Sale Securities Fair Value Disclosure	74,680,000	78,183,000
Percentage Of Total Available For Sale Securities	35.70%	68.60%
Equity Securities Other Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	133,037,000	35,352,000
Available For Sale Securities Gross Unrealized Gain	1,555,000	1,903,000
Available For Sale Securities Gross Unrealized Losses	0	1,538,000
Available For Sale Securities Fair Value Disclosure	$ 134,592,000	$ 35,717,000
Percentage Of Total Available For Sale Securities	64.30%	31.40%

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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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