Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Segment Reporting Information [Line Items]
Net revenues:	$ 1,310.8	$ 1,189.8	$ 2,590.6	$ 2,345.1
Percent change in net revenues	10.20%		10.50%
Gross profit:	$ 911.5	839.2	$ 1,808.7	1,655.5
Percent change in gross profit	8.60%		9.30%
Operating profit	$ 413.8	367.0	$ 822.6	731.7
Percent change in operating profit	12.80%		12.40%
Long-lived assets:	$ 190.8	180.9	$ 190.8	180.9
Percent change in long-lived assets	5.50%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 50.9	50.8	103.8	97.9
Application Software
Segment Reporting Information [Line Items]
Net revenues:	$ 627.5	587.9	$ 1,255.7	1,161.0
Percent change in net revenues	6.70%		8.20%
Gross profit:	$ 430.9	407.3	$ 866.3	804.5
Percent change in gross profit	5.80%		7.70%
Operating profit	$ 165.3	153.5	$ 337.6	307.0
Percent change in operating profit	7.70%		10.00%
Long-lived assets:	$ 136.6	127.9	$ 136.6	127.9
Percent change in long-lived assets	6.80%
Network Software
Segment Reporting Information [Line Items]
Net revenues:	$ 342.9	297.8	$ 681.4	585.3
Percent change in net revenues	15.10%		16.40%
Gross profit:	$ 289.1	250.1	$ 574.0	489.6
Percent change in gross profit	15.60%		17.20%
Operating profit	$ 137.1	111.2	$ 273.9	216.8
Percent change in operating profit	23.30%		26.30%
Long-lived assets:	$ 27.1	25.3	$ 27.1	25.3
Percent change in long-lived assets	7.10%
Technology Enabled Products
Segment Reporting Information [Line Items]
Net revenues:	$ 340.4	304.1	$ 653.5	598.8
Percent change in net revenues	11.90%		9.10%
Gross profit:	$ 191.5	181.8	$ 368.4	361.4
Percent change in gross profit	5.30%		1.90%
Operating profit	$ 111.4	102.3	$ 211.1	207.9
Percent change in operating profit	8.90%		1.50%
Long-lived assets:	$ 27.1	$ 27.7	$ 27.1	$ 27.7
Percent change in long-lived assets	(2.20%)