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Taxation (Income Before Income Taxes, Foreign and Domestic) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Income Tax Expense (Benefit)
Income from continuing operations before taxes	$ 220,978us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 104,132us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 162,222us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 199,532us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 329,778us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 239,668us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 45,888us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 225,704us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 686,864us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 841,038us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	$ 766,838us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Bermuda | Domestic Country
Income Tax Expense (Benefit)
Domestic									701,476us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_StatementGeographicalAxis = country_BM	873,103us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_StatementGeographicalAxis = country_BM	795,378us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic / us-gaap_IncomeTaxAuthorityAxis = us-gaap_DomesticCountryMember / us-gaap_StatementGeographicalAxis = country_BM
United Kingdom | Foreign
Income Tax Expense (Benefit)
Foreign									(3,166)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_GB	(12,678)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_GB	(15,404)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_GB
U.S. | Internal Revenue Service (IRS)
Income Tax Expense (Benefit)
Foreign									(10,977)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_StatementGeographicalAxis = country_US	(20,019)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_StatementGeographicalAxis = country_US	(16,467)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_InternalRevenueServiceIRSMember / us-gaap_StatementGeographicalAxis = country_US
Ireland | Foreign
Income Tax Expense (Benefit)
Foreign									1,549us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IE	1,855us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IE	3,318us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_IE
Singapore | Foreign
Income Tax Expense (Benefit)
Foreign									$ (2,018)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_SG	$ (1,223)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_SG	$ 13us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesForeign / us-gaap_IncomeTaxAuthorityAxis = us-gaap_ForeignCountryMember / us-gaap_StatementGeographicalAxis = country_SG

X

- Definition

The portion of earnings or loss from continuing operations before income taxes that is attributable to domestic operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(h)(1)(i))

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- Definition

This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 940

-SubTopic 20

-Section 25

-Paragraph 1

-URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953



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Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

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-Paragraph 10

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+ References

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-Topic 235

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