Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenues	$ 372.0	$ 351.9	$ 736.4	$ 698.8
Costs and expenses:
Cost of revenues	50.3	49.5	100.2	100.2
Research and development	22.2	20.3	46.4	43.2
Selling, General and Administrative Expense	50.8	46.1	99.8	94.6
Total costs and expenses	123.3	115.9	246.4	238.0
Operating income	248.7	236.0	490.0	460.8
Interest expense	(18.9)	(18.9)	(37.7)	(37.7)
Non-operating income (loss), net	12.7	1.6	24.0	1.9
Income (Loss) before Income Taxes, Total	242.5	218.7	476.3	425.0
Income tax expense	(56.8)	(51.4)	(111.9)	(100.2)
Net Income	185.7	167.3	364.4	324.8
Other comprehensive income (loss)	(0.7)	0.1	(0.7)	(0.1)
Comprehensive Income	$ 185.0	$ 167.4	$ 363.7	$ 324.7
Basic income (loss) per share
Net Income	$ 1.79	$ 1.54	$ 3.49	$ 2.97
Diluted income (loss) per share
Net Income	$ 1.79	$ 1.54	$ 3.49	$ 2.96
Shares used to compute net income per share
Basic	103.9	108.8	104.4	109.5
Diluted	104.0	108.8	104.5	109.6