Income Taxes (Valuation Allowance) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Valuation Allowance [Line Items]
Valuation allowance	$ 156,800,000				$ 140,500,000				$ 156,800,000	$ 140,500,000
Change in valuation allowance									18,700,000	36,000,000	$ 49,900,000
Income Tax Expense (Benefit)	(1,500,000)	$ (1,600,000)	$ (2,200,000)	$ 4,600,000	(26,200,000)	$ (4,700,000)	$ 7,100,000	$ 9,000,000	(700,000)	(14,800,000)	$ 32,600,000
Net operating losses in Luxembourg subsidiaries
Valuation Allowance [Line Items]
Valuation allowance	28,300,000								28,300,000
U.S. losses and other federal deferred tax benefits
Valuation Allowance [Line Items]
Valuation allowance	122,900,000				107,500,000				122,900,000	107,500,000
Net Operating Losses in Israel Subsidiaries [Member]
Valuation Allowance [Line Items]
Valuation allowance	5,500,000				1,900,000				5,500,000	1,900,000
Net Operating Losses in Netherlands Subsidiaries [Member] [Member]
Valuation Allowance [Line Items]
Valuation allowance	$ 100,000								100,000
Non-US | Net operating losses in Luxembourg subsidiaries
Valuation Allowance [Line Items]
Change in valuation allowance									300,000	15,700,000
Non-US | Net Operating Losses in Israel Subsidiaries [Member]
Valuation Allowance [Line Items]
Change in valuation allowance									3,000,000	1,200,000
Subsidiaries | Luxembourg | Net operating losses in Luxembourg subsidiaries
Valuation Allowance [Line Items]
Valuation allowance					31,000,000					31,000,000
Subsidiaries | NETHERLANDS | Net operating losses in Luxembourg subsidiaries
Valuation Allowance [Line Items]
Valuation allowance					$ 100,000					100,000
Guilford Holdings, Inc. | UNITED STATES
Valuation Allowance [Line Items]
Change in valuation allowance									8,200,000	7,200,000
BAM
Valuation Allowance [Line Items]
Change in valuation allowance									6,300,000	8,500,000
Income Tax Expense (Benefit)									(8,700,000)	4,900,000
Houston General Insurance [Member]
Valuation Allowance [Line Items]
Change in valuation allowance									(500,000)	0.1
Star & Shield Insurance Exchange [Member]
Valuation Allowance [Line Items]
Change in valuation allowance									$ (1,200,000)	$ (3,200,000)