Segment Information (Narrative) (Details) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) segment	Sep. 30, 2017 USD ($)
Segment Reporting Information [Line Items]
Number of reportable segments | segment			2
PIRM
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	$ 1.7	$ 1.6	$ 4.9	$ 4.6
Segment reporting intercompany expense	0.7	1.0	2.3	2.5
UWS
Segment Reporting Information [Line Items]
Segment reporting intercompany revenue	0.7	1.0	2.3	2.5
Segment reporting intercompany expense	$ 1.7	$ 1.6	$ 4.9	$ 4.6