Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Segment Reporting Information [Line Items]
Net revenues:	$ 1,764.6	$ 1,563.4	$ 5,162.1	$ 4,564.3
Percent change in net revenues	12.90%		13.10%
Gross profit:	$ 1,221.7	1,096.3	$ 3,596.0	3,182.0
Percent change in gross profit	11.40%		13.00%
Operating profit	$ 566.9	508.4	$ 1,666.6	1,458.0
Percent change in operating profit	11.50%		14.30%
Long-lived assets:	$ 253.8	233.4	$ 253.8	233.4
Percent change in long-lived assets	8.70%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 70.3	62.3	194.5	175.6
Application Software
Segment Reporting Information [Line Items]
Net revenues:	$ 984.4	803.4	$ 2,811.4	2,335.1
Percent change in net revenues	22.50%		20.40%
Gross profit:	$ 672.8	557.7	$ 1,939.6	1,609.2
Percent change in gross profit	20.60%		20.50%
Operating profit	$ 259.8	206.9	$ 750.5	601.3
Percent change in operating profit	25.60%		24.80%
Long-lived assets:	$ 197.0	176.0	$ 197.0	176.0
Percent change in long-lived assets	11.90%
Network Software
Segment Reporting Information [Line Items]
Net revenues:	$ 367.1	364.1	$ 1,102.1	1,076.7
Percent change in net revenues	0.80%		2.40%
Gross profit:	$ 311.8	310.7	$ 935.9	914.0
Percent change in gross profit	0.40%		2.40%
Operating profit	$ 166.0	164.4	$ 492.1	465.0
Percent change in operating profit	1.00%		5.80%
Long-lived assets:	$ 23.2	26.7	$ 23.2	26.7
Percent change in long-lived assets	(13.10%)
Technology Enabled Products
Segment Reporting Information [Line Items]
Net revenues:	$ 413.1	395.9	$ 1,248.6	1,152.5
Percent change in net revenues	4.30%		8.30%
Gross profit:	$ 237.1	227.9	$ 720.5	658.8
Percent change in gross profit	4.00%		9.40%
Operating profit	$ 141.1	137.1	$ 424.0	391.7
Percent change in operating profit	2.90%		8.20%
Long-lived assets:	$ 33.6	$ 30.7	$ 33.6	$ 30.7
Percent change in long-lived assets	9.40%