Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Segment Reporting Information [Line Items]
Net revenues:	$ 1,563.4	$ 1,350.3	$ 4,564.3	$ 3,940.9
Percent change in net revenues	15.80%		15.80%
Gross profit:	$ 1,096.3	941.8	$ 3,182.0	2,750.5
Percent change in gross profit	16.40%		15.70%
Operating profit	$ 508.4	448.4	$ 1,458.0	1,271.0
Percent change in operating profit	13.40%		14.70%
Long-lived assets:	$ 233.4	199.6	$ 233.4	199.6
Percent change in long-lived assets	16.90%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 62.3	55.2	175.6	159.0
Application Software
Segment Reporting Information [Line Items]
Net revenues:	$ 803.4	644.0	$ 2,335.1	1,899.7
Percent change in net revenues	24.80%		22.90%
Gross profit:	$ 557.7	440.2	$ 1,609.2	1,306.5
Percent change in gross profit	26.70%		23.20%
Operating profit	$ 206.9	173.8	$ 601.3	511.4
Percent change in operating profit	19.00%		17.60%
Long-lived assets:	$ 176.0	145.1	$ 176.0	145.1
Percent change in long-lived assets	21.30%
Network Software
Segment Reporting Information [Line Items]
Net revenues:	$ 364.1	346.6	$ 1,076.7	1,028.0
Percent change in net revenues	5.00%		4.70%
Gross profit:	$ 310.7	293.9	$ 914.0	867.9
Percent change in gross profit	5.70%		5.30%
Operating profit	$ 164.4	148.1	$ 465.0	422.0
Percent change in operating profit	11.00%		10.20%
Long-lived assets:	$ 26.7	27.6	$ 26.7	27.6
Percent change in long-lived assets	(3.30%)
Technology Enabled Products
Segment Reporting Information [Line Items]
Net revenues:	$ 395.9	359.7	$ 1,152.5	1,013.2
Percent change in net revenues	10.10%		13.70%
Gross profit:	$ 227.9	207.7	$ 658.8	576.1
Percent change in gross profit	9.70%		14.40%
Operating profit	$ 137.1	126.5	$ 391.7	337.6
Percent change in operating profit	8.40%		16.00%
Long-lived assets:	$ 30.7	$ 26.9	$ 30.7	$ 26.9
Percent change in long-lived assets	14.10%