Revenues - Disaggregation of Revenue (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Disaggregation of Revenue [Line Items]
Revenues	$ 1,114.0
Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	854.9
Professional services
Disaggregation of Revenue [Line Items]
Revenues	126.3
Data solutions
Disaggregation of Revenue [Line Items]
Revenues	119.7
Other
Disaggregation of Revenue [Line Items]
Revenues	13.1
Operating Segments | Software Solutions
Disaggregation of Revenue [Line Items]
Revenues	962.0
Operating Segments | Software Solutions | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	825.1
Operating Segments | Software Solutions | Professional services
Disaggregation of Revenue [Line Items]
Revenues	126.7
Operating Segments | Software Solutions | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0
Operating Segments | Software Solutions | Other
Disaggregation of Revenue [Line Items]
Revenues	10.2
Operating Segments | Data and Analytics
Disaggregation of Revenue [Line Items]
Revenues	154.5
Operating Segments | Data and Analytics | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	29.8
Operating Segments | Data and Analytics | Professional services
Disaggregation of Revenue [Line Items]
Revenues	2.1
Operating Segments | Data and Analytics | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	119.7
Operating Segments | Data and Analytics | Other
Disaggregation of Revenue [Line Items]
Revenues	2.9
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	(2.5)
Corporate and Other | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0
Corporate and Other | Professional services
Disaggregation of Revenue [Line Items]
Revenues	(2.5)
Corporate and Other | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0
Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues	0.0
Reportable Legal Entities | Servicing Software
Disaggregation of Revenue [Line Items]
Revenues	799.0
Reportable Legal Entities | Servicing Software | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	716.3
Reportable Legal Entities | Servicing Software | Professional services
Disaggregation of Revenue [Line Items]
Revenues	82.2
Reportable Legal Entities | Servicing Software | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0
Reportable Legal Entities | Servicing Software | Other
Disaggregation of Revenue [Line Items]
Revenues	0.5
Reportable Legal Entities | Origination Software
Disaggregation of Revenue [Line Items]
Revenues	163.0
Reportable Legal Entities | Origination Software | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	108.8
Reportable Legal Entities | Origination Software | Professional services
Disaggregation of Revenue [Line Items]
Revenues	44.5
Reportable Legal Entities | Origination Software | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0
Reportable Legal Entities | Origination Software | Other
Disaggregation of Revenue [Line Items]
Revenues	$ 9.7