Segment Information (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2016 USD ($) segment	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)
Segment Reporting Information [Line Items]
Number of Reportable Segments | segment	2
Operating Segments [Member] | Property Intelligence [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information Intercompany Revenue	$ 5.5	$ 5.5	$ 4.3
Segment Reporting Information Intercompany Expense	4.6	4.8	5.6
Operating Segments [Member] | Risk Management and Work Flow [Member]
Segment Reporting Information [Line Items]
Segment Reporting Information Intercompany Revenue	4.6	4.8	5.5
Segment Reporting Information Intercompany Expense	$ 5.5	$ 5.5	$ 4.3