Revenues - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 293.1	$ 294.9	$ 583.8	$ 578.0
Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	219.6	224.5	441.3	440.3
Professional services
Disaggregation of Revenue [Line Items]
Revenues	30.8	32.0	59.2	64.8
Data solutions
Disaggregation of Revenue [Line Items]
Revenues	38.9	30.8	75.7	61.6
Other
Disaggregation of Revenue [Line Items]
Revenues	3.8	7.6	7.6	11.3
Reportable Legal Entities | Software Services
Disaggregation of Revenue [Line Items]
Revenues	184.3	210.7	380.0	412.5
Reportable Legal Entities | Software Services | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	166.5	184.8	343.5	364.5
Reportable Legal Entities | Software Services | Professional services
Disaggregation of Revenue [Line Items]
Revenues	17.8	21.1	36.5	42.9
Reportable Legal Entities | Software Services | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Reportable Legal Entities | Software Services | Other
Disaggregation of Revenue [Line Items]
Revenues	0.0	4.8	0.0	5.1
Reportable Legal Entities | Origination Software
Disaggregation of Revenue [Line Items]
Revenues	60.8	44.7	109.8	86.4
Reportable Legal Entities | Origination Software | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	44.6	31.9	80.9	60.1
Reportable Legal Entities | Origination Software | Professional services
Disaggregation of Revenue [Line Items]
Revenues	13.0	10.7	22.5	21.4
Reportable Legal Entities | Origination Software | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Reportable Legal Entities | Origination Software | Other
Disaggregation of Revenue [Line Items]
Revenues	3.2	2.1	6.4	4.9
Operating Segments | Software Solutions
Disaggregation of Revenue [Line Items]
Revenues	245.1	255.4	489.8	498.9
Operating Segments | Software Solutions | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	211.1	216.7	424.4	424.6
Operating Segments | Software Solutions | Professional services
Disaggregation of Revenue [Line Items]
Revenues	30.8	31.8	59.0	64.3
Operating Segments | Software Solutions | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Operating Segments | Software Solutions | Other
Disaggregation of Revenue [Line Items]
Revenues	3.2	6.9	6.4	10.0
Operating Segments | Data and Analytics
Disaggregation of Revenue [Line Items]
Revenues	48.2	39.7	94.3	79.4
Operating Segments | Data and Analytics | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	8.5	7.8	16.9	15.7
Operating Segments | Data and Analytics | Professional services
Disaggregation of Revenue [Line Items]
Revenues	0.2	0.4	0.5	0.8
Operating Segments | Data and Analytics | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	38.9	30.8	75.7	61.6
Operating Segments | Data and Analytics | Other
Disaggregation of Revenue [Line Items]
Revenues	0.6	0.7	1.2	1.3
Corporate and Other
Disaggregation of Revenue [Line Items]
Revenues	(0.2)	(0.2)	(0.3)	(0.3)
Corporate and Other | Software and hosting solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Professional services
Disaggregation of Revenue [Line Items]
Revenues	(0.2)	(0.2)	(0.3)	(0.3)
Corporate and Other | Data solutions
Disaggregation of Revenue [Line Items]
Revenues	0.0	0.0	0.0	0.0
Corporate and Other | Other
Disaggregation of Revenue [Line Items]
Revenues	$ 0.0	$ 0.0	$ 0.0	$ 0.0