Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Revenues	$ 409.9	$ 387.1	$ 812.2	$ 771.4
Costs and expenses:
Cost of revenues	49.1	47.1	98.5	96.2
Research and development	25.7	23.8	51.7	48.6
Selling, General and Administrative Expense	54.4	50.0	110.1	101.5
Total costs and expenses	129.2	120.9	260.3	246.3
Operating income	280.7	266.2	551.9	525.1
Interest expense	(18.9)	(18.8)	(39.2)	(37.6)
Non-operating income (loss), net	5.5	11.5	13.0	25.4
Income (Loss) before Income Taxes, Total	267.3	258.9	525.7	512.9
Income tax expense	(59.9)	(60.1)	(119.0)	(120.0)
Net Income	207.4	198.8	406.7	392.9
Other comprehensive income (loss)	0.0	0.0	(0.3)	(0.2)
Comprehensive Income	$ 207.4	$ 198.8	$ 406.4	$ 392.7
Income (Loss) from Continuing Operations, Per Basic Share	$ 2.21	$ 2.01	$ 4.32	$ 3.93
Income (Loss) from Continuing Operations, Per Diluted Share	$ 2.21	$ 2.01	$ 4.31	$ 3.93
Basic	93.8	98.9	94.2	99.9
Diluted	94.0	99.0	94.4	99.9
Basic income (loss) per share
Net Income	$ 2.21	$ 2.01	$ 4.32	$ 3.93
Diluted income (loss) per share
Net Income	$ 2.21	$ 2.01	$ 4.31	$ 3.93
Shares used to compute net income per share
Basic	93.8	98.9	94.2	99.9
Diluted	94.0	99.0	94.4	99.9