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Investments (Details 4) (USD $)	Jun. 30, 2012	Dec. 31, 2011
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 7,675,473,000	$ 6,931,958,000
Available For Sale Securities Gross Unrealized Losses	196,299,000	292,486,000
Available For Sale Securities Fair Value Disclosure	8,401,909,000	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	14,957,165,000	14,182,880,000
Available For Sale Securities Gross Unrealized Gain	2,480,852,000	2,300,036,000
Available For Sale Securities Gross Unrealized Losses	193,825,000	281,966,000
Available For Sale Securities Fair Value Disclosure	17,244,192,000	16,200,950,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(10,160,000)	(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	75,500,000	117,840,000
Available For Sale Securities Gross Unrealized Gain	6,171,000	6,580,000
Available For Sale Securities Gross Unrealized Losses	2,474,000	10,520,000
Available For Sale Securities Fair Value Disclosure	79,197,000	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	7,675,473,000	6,931,958,000
Available For Sale Securities Gross Unrealized Gain	792,051,000	654,519,000
Available For Sale Securities Gross Unrealized Losses	65,615,000	125,371,000
Available For Sale Securities Fair Value Disclosure	8,401,909,000	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	48.70%	46.00%
Canadian Provincial Governments [Member] | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,579,161,000	2,507,802,000
Available For Sale Securities Gross Unrealized Gain	1,350,301,000	1,362,160,000
Available For Sale Securities Gross Unrealized Losses	88,000	29,000
Available For Sale Securities Fair Value Disclosure	3,929,374,000	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	22.80%	23.90%
Residential Mortgage Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,007,793,000	1,167,265,000
Available For Sale Securities Gross Unrealized Gain	78,727,000	76,393,000
Available For Sale Securities Gross Unrealized Losses	7,958,000	16,424,000
Available For Sale Securities Fair Value Disclosure	1,078,562,000	1,227,234,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(520,000)	(1,042,000)
Percentage Of Total Available For Sale Securities	6.30%	7.60%
Asset Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	469,616,000	443,974,000
Available For Sale Securities Gross Unrealized Gain	12,746,000	11,692,000
Available For Sale Securities Gross Unrealized Losses	41,311,000	53,675,000
Available For Sale Securities Fair Value Disclosure	441,051,000	401,991,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(3,521,000)	(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	1,308,668,000	1,233,958,000
Available For Sale Securities Gross Unrealized Gain	107,284,000	87,750,000
Available For Sale Securities Gross Unrealized Losses	67,905,000	79,489,000
Available For Sale Securities Fair Value Disclosure	1,348,047,000	1,242,219,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(6,119,000)	(12,225,000)
Percentage Of Total Available For Sale Securities	7.80%	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	218,164,000	341,087,000
Available For Sale Securities Gross Unrealized Gain	31,761,000	32,976,000
Available For Sale Securities Gross Unrealized Losses	11,000	61,000
Available For Sale Securities Fair Value Disclosure	249,914,000	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	1.40%	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	204,108,000	184,308,000
Available For Sale Securities Gross Unrealized Gain	34,066,000	24,419,000
Available For Sale Securities Gross Unrealized Losses	8,398,000	3,341,000
Available For Sale Securities Fair Value Disclosure	229,776,000	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	1,494,182,000	1,372,528,000
Available For Sale Securities Gross Unrealized Gain	73,916,000	50,127,000
Available For Sale Securities Gross Unrealized Losses	2,539,000	3,576,000
Available For Sale Securities Fair Value Disclosure	1,565,559,000	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	9.10%	0.00%
Nonredeemable Preferred Stock Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	73,265,000	82,488,000
Available For Sale Securities Gross Unrealized Gain	5,170,000	4,677,000
Available For Sale Securities Gross Unrealized Losses	2,465,000	8,982,000
Available For Sale Securities Fair Value Disclosure	75,970,000	78,183,000
Percentage Of Total Available For Sale Securities	95.90%	68.60%
Equity Securities Other Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,235,000	35,352,000
Available For Sale Securities Gross Unrealized Gain	1,001,000	1,903,000
Available For Sale Securities Gross Unrealized Losses	9,000	1,538,000
Available For Sale Securities Fair Value Disclosure	$ 3,227,000	$ 35,717,000
Percentage Of Total Available For Sale Securities	4.10%	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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