Segment Information (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment	2
PIRM
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	$ 1.5	$ 1.4
Segment reporting intercompany expense	0.8	0.7
UWS
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	0.8	0.7
Segment reporting intercompany expense	$ 1.5	$ 1.4