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Income Taxes (Valuation Allowance) (Details) (USD $) | 3 Months Ended | 12 Months Ended |  |  |  |  |  | 2 Months Ended | 12 Months Ended | 3 Months Ended |  | 3 Months Ended | 12 Months Ended
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Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Net operating losses in Luxembourg subsidiaries | Dec. 31, 2012 Net operating losses in Luxembourg subsidiaries | Dec. 31, 2013 U.S. losses and other federal deferred tax benefits | Dec. 31, 2012 U.S. losses and other federal deferred tax benefits | Dec. 31, 2013 Net Operating Losses in Netherlands Subsidiaries [Member] [Member] | Dec. 31, 2013 Luxembourg | Dec. 31, 2013 Luxembourg | Dec. 31, 2013 Luxembourg Tax benefit | Dec. 31, 2013 Luxembourg Tax Expense [Member] | Dec. 31, 2012 Sirius Re Holdings Inc. | Dec. 31, 2013 Sirius Re Holdings Inc. | Dec. 31, 2012 Guilford Holdings, Inc. UNITED STATES | Dec. 31, 2013 BAM | Dec. 31, 2012 BAM | Dec. 31, 2012 Houston General Insurance [Member]
Valuation Allowance [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Valuation allowance | $ 289,800,000 |  |  |  | $ 254,000,000 |  |  |  | $ 289,800,000 | $ 254,000,000 |  | $ 195,800,000 | $ 192,000,000 | $ 93,700,000 | $ 62,000,000 | $ 300,000 |  |  |  |  |  |  |  |  |  |
Change in valuation allowance |  |  |  |  |  |  |  |  | (33,600,000) | (14,100,000) | 128,200,000 |  |  |  |  |  | (41,300,000) | (1,400,000) | (16,700,000) | (18,100,000) | (3,900,000) |  | (16,600,000) |  | (21,300,000) | (6.0)
Income Tax Expense (Benefit) | 27,400,000 | 8,200,000 | (600,000) | 41,600,000 | (101,000,000) | 47,800,000 | 6,400,000 | 31,100,000 | 76,600,000 | (15,700,000) | (110,000,000) |  |  |  |  |  |  |  |  |  |  |  |  | 5,400,000 |  |
Foreign tax credit carryforwards, subject to expiration |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,200,000 |  |  |  |

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible foreign tax credit carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32621-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32632-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing 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)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Income Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6515339 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=21917399&loc=d3e32123-109318 + Details
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