Business Segments (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Segment Reporting Information [Line Items]
Net revenues:	$ 1,350.3	$ 1,232.1	$ 3,940.9	$ 3,577.2
Percent change in net revenues	9.60%		10.20%
Gross profit:	$ 941.8	871.7	$ 2,750.5	2,527.2
Percent change in gross profit	8.00%		8.80%
Operating profit	$ 448.4	394.8	$ 1,271.0	1,126.5
Percent change in operating profit	13.60%		12.80%
Long-lived assets:	$ 199.6	181.0	$ 199.6	181.0
Percent change in long-lived assets	10.30%
Corporate
Segment Reporting Information [Line Items]
Unallocated corporate general and administrative expenses	$ 55.2	47.9	159.0	145.8
Application Software
Segment Reporting Information [Line Items]
Net revenues:	$ 644.0	600.2	$ 1,899.7	1,761.2
Percent change in net revenues	7.30%		7.90%
Gross profit:	$ 440.2	418.5	$ 1,306.5	1,223.0
Percent change in gross profit	5.20%		6.80%
Operating profit	$ 173.8	164.2	$ 511.4	471.2
Percent change in operating profit	5.80%		8.50%
Long-lived assets:	$ 145.1	129.8	$ 145.1	129.8
Percent change in long-lived assets	11.80%
Network Software
Segment Reporting Information [Line Items]
Net revenues:	$ 346.6	316.0	$ 1,028.0	901.3
Percent change in net revenues	9.70%		14.10%
Gross profit:	$ 293.9	267.5	$ 867.9	757.1
Percent change in gross profit	9.90%		14.60%
Operating profit	$ 148.1	126.5	$ 422.0	343.3
Percent change in operating profit	17.10%		22.90%
Long-lived assets:	$ 27.6	25.0	$ 27.6	25.0
Percent change in long-lived assets	10.40%
Technology Enabled Products
Segment Reporting Information [Line Items]
Net revenues:	$ 359.7	315.9	$ 1,013.2	914.7
Percent change in net revenues	13.90%		10.80%
Gross profit:	$ 207.7	185.7	$ 576.1	547.1
Percent change in gross profit	11.80%		5.30%
Operating profit	$ 126.5	104.1	$ 337.6	312.0
Percent change in operating profit	21.50%		8.20%
Long-lived assets:	$ 26.9	$ 26.2	$ 26.9	$ 26.2
Percent change in long-lived assets	2.70%