Acquisitions - Schedule of Severance Expense Recognized (Detail) - DST and Algorithmics [Member] - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	$ 6.5	$ 22.9
Total Cost of Revenues [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	4.5	15.3
Total Cost of Revenues [Member] | Software-enabled Services [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	3.8	14.1
Total Cost of Revenues [Member] | License, Maintenance and Related [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	0.7	1.2
Selling and Marketing [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	1.2	1.2
Research and Development [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	0.8	5.8
General and Administrative [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense		0.6
Total Operating Expenses [Member]
Business Combination Separately Recognized Transactions [Line Items]
Total severance expense	$ 2.0	$ 7.6