Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Revenues	$ 376.3	$ 356.9	$ 1,112.7	$ 1,055.7
Costs and expenses:
Cost of revenues	48.6	50.0	148.8	150.2
Research and development	21.7	21.0	68.1	64.2
Selling, General and Administrative Expense	51.7	49.1	151.5	143.7
Total costs and expenses	122.0	120.1	368.4	358.1
Operating income	254.3	236.8	744.3	697.6
Interest expense	(18.8)	(18.8)	(56.5)	(56.5)
Non-operating income (loss), net	13.1	4.9	37.1	6.8
Income (Loss) before Income Taxes, Total	248.6	222.9	724.9	647.9
Income tax expense	(60.1)	(53.4)	(172.0)	(153.6)
Net Income	188.5	169.5	552.9	494.3
Other comprehensive income (loss)	0.4	0.2	(0.3)	0.1
Comprehensive Income	$ 188.9	$ 169.7	$ 552.6	$ 494.4
Basic income (loss) per share
Net Income	$ 1.83	$ 1.58	$ 5.32	$ 4.55
Diluted income (loss) per share
Net Income	$ 1.83	$ 1.58	$ 5.32	$ 4.55
Shares used to compute net income per share
Basic	102.9	107.1	103.9	108.7
Diluted	103.0	107.1	104.0	108.7