Revenues from Contracts - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Disaggregation of Revenue [Line Items]
Net revenues	$ 1,310.8	$ 1,189.8	$ 2,590.6	$ 2,345.1
Application Software
Disaggregation of Revenue [Line Items]
Net revenues	627.5	587.9	1,255.7	1,161.0
Network Software
Disaggregation of Revenue [Line Items]
Net revenues	342.9	297.8	681.4	585.3
Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	340.4	304.1	653.5	598.8
Software related
Disaggregation of Revenue [Line Items]
Net revenues	973.5	887.7	1,943.1	1,750.1
Software related | Application Software
Disaggregation of Revenue [Line Items]
Net revenues	627.5	587.9	1,255.7	1,161.0
Software related | Network Software
Disaggregation of Revenue [Line Items]
Net revenues	342.9	297.8	681.4	585.3
Software related | Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	3.1	2.0	6.0	3.8
Recurring
Disaggregation of Revenue [Line Items]
Net revenues	705.2	628.1	1,406.5	1,243.9
Recurring | Application Software
Disaggregation of Revenue [Line Items]
Net revenues	457.9	422.3	919.4	841.1
Recurring | Network Software
Disaggregation of Revenue [Line Items]
Net revenues	244.5	204.0	481.7	399.4
Recurring | Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	2.8	1.8	5.4	3.4
Reoccurring
Disaggregation of Revenue [Line Items]
Net revenues	90.6	86.6	182.8	171.8
Reoccurring | Application Software
Disaggregation of Revenue [Line Items]
Net revenues	28.6	27.4	60.3	53.6
Reoccurring | Network Software
Disaggregation of Revenue [Line Items]
Net revenues	62.0	59.2	122.5	118.2
Reoccurring | Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Non-recurring
Disaggregation of Revenue [Line Items]
Net revenues	177.7	173.0	353.8	334.4
Non-recurring | Application Software
Disaggregation of Revenue [Line Items]
Net revenues	141.0	138.2	276.0	266.3
Non-recurring | Network Software
Disaggregation of Revenue [Line Items]
Net revenues	36.4	34.6	77.2	67.7
Non-recurring | Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	0.3	0.2	0.6	0.4
Product Revenue
Disaggregation of Revenue [Line Items]
Net revenues	337.3	302.1	647.5	595.0
Product Revenue | Application Software
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Product Revenue | Network Software
Disaggregation of Revenue [Line Items]
Net revenues	0.0	0.0	0.0	0.0
Product Revenue | Technology Enabled Products
Disaggregation of Revenue [Line Items]
Net revenues	$ 337.3	$ 302.1	$ 647.5	$ 595.0