Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Segment Reporting Information [Line Items]
Net revenues:	$ 1,531.2	$ 1,310.8	$ 3,000.9	$ 2,590.6
Percent change in net revenues	16.80%		15.80%
Gross profit:	$ 1,067.1	911.5	$ 2,085.7	1,808.7
Percent change in gross profit	17.10%		15.30%
Operating profit	$ 493.4	413.8	$ 949.6	822.6
Percent change in operating profit	19.20%		15.40%
Long-lived assets:	$ 220.4	190.8	$ 220.4	190.8
Percent change in long-lived assets	15.50%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 58.1	50.9	113.3	103.8
Application Software
Segment Reporting Information [Line Items]
Net revenues:	$ 770.3	627.5	$ 1,531.7	1,255.7
Percent change in net revenues	22.80%		22.00%
Gross profit:	$ 531.0	430.9	$ 1,051.5	866.3
Percent change in gross profit	23.20%		21.40%
Operating profit	$ 201.2	165.3	$ 394.4	337.6
Percent change in operating profit	21.70%		16.80%
Long-lived assets:	$ 161.9	136.6	$ 161.9	136.6
Percent change in long-lived assets	18.50%
Network Software
Segment Reporting Information [Line Items]
Net revenues:	$ 358.1	342.9	$ 712.6	681.4
Percent change in net revenues	4.40%		4.60%
Gross profit:	$ 303.9	289.1	$ 603.3	574.0
Percent change in gross profit	5.10%		5.10%
Operating profit	$ 153.1	137.1	$ 300.6	273.9
Percent change in operating profit	11.70%		9.70%
Long-lived assets:	$ 28.7	27.1	$ 28.7	27.1
Percent change in long-lived assets	5.90%
Technology Enabled Products
Segment Reporting Information [Line Items]
Net revenues:	$ 402.8	340.4	$ 756.6	653.5
Percent change in net revenues	18.30%		15.80%
Gross profit:	$ 232.2	191.5	$ 430.9	368.4
Percent change in gross profit	21.30%		17.00%
Operating profit	$ 139.1	111.4	$ 254.6	211.1
Percent change in operating profit	24.90%		20.60%
Long-lived assets:	$ 29.8	$ 27.1	$ 29.8	$ 27.1
Percent change in long-lived assets	10.00%