Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Revenues	$ 419.1	$ 390.6	$ 1,231.3	$ 1,162.0
Costs and expenses:
Cost of revenues	48.8	46.8	147.3	143.0
Research and development	25.4	23.2	77.1	71.8
Selling, General and Administrative Expense	60.6	51.3	170.7	152.8
Total costs and expenses	134.8	121.3	395.1	367.6
Operating income	284.3	269.3	836.2	794.4
Interest expense	(18.9)	(18.9)	(58.1)	(56.5)
Non-operating income (loss), net	6.3	10.5	19.3	35.9
Income (Loss) before Income Taxes, Total	271.7	260.9	797.4	773.8
Income tax expense	(58.9)	(59.6)	(177.9)	(179.6)
Net Income	212.8	201.3	619.5	594.2
Other comprehensive income (loss)	0.1	0.4	(0.2)	0.2
Comprehensive Income	$ 212.9	$ 201.7	$ 619.3	$ 594.4
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.28	$ 2.07	$ 6.60	$ 6.00
Income (Loss) from Continuing Operations, Per Diluted Share	$ 2.27	$ 2.07	$ 6.58	$ 6.00
Basic	93.3	97.3	93.9	99.0
Diluted	93.6	97.3	94.1	99.1
Basic income (loss) per share
Net Income	$ 2.28	$ 2.07	$ 6.60	$ 6.00
Diluted income (loss) per share
Net Income	$ 2.27	$ 2.07	$ 6.58	$ 6.00
Shares used to compute net income per share
Basic	93.3	97.3	93.9	99.0
Diluted	93.6	97.3	94.1	99.1