Divestitures - Narrative (Details) (USD $)	0 Months Ended	12 Months Ended		0 Months Ended	3 Months Ended
	Apr. 16, 2014	Dec. 31, 2014	Dec. 31, 2013	Aug. 18, 2014	Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of subsidiary		$ 54,748,000	$ 0
Bonus payments to StreetLinks employees	1,000,000
Advent Financial Services LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from Sale of Intangible Assets				1,000,000
Gain on Disposition of Intangible Assets				800,000
StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on sale of subsidiary, before Income Tax		48,200,000
Transaction-related costs		1,800,000
Purchase and Sale Agreement [Member] | Assurant Services, LLC [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash received at closing, including portion attributable to noncontrolling interests	60,000,000
Proceeds from sale of subsidiary	53,900,000
Proceeds from sale of subsidiary, adjustments for working capital					800,000
Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member] | Assurant Services, LLC [Member] | StreetLinks LLC [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, maximum	12,000,000
2015 [Member] | Minimum [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, total revenue requirement	184,000,000
2016 [Member] | Minimum [Member] | Contingent Consideration Receivable [Member] | Purchase and Sale Agreement [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Post-closing consideration, total revenue requirement	167,500,000
Potential Bonus Payments to StreetLinks Employees [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Potential reduction of proceeds, maximum	$ 2,000,000