Condensed Consolidated Statements Of Comprehensive Income - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Revenues	$ 351.9	$ 329.4	$ 698.8	$ 653.0
Costs and expenses:
Cost of revenues	49.5	47.8	100.2	94.8
Research and development	20.3	19.8	43.2	40.1
Selling, General and Administrative Expense	46.1	48.8	94.6	94.7
Total costs and expenses	115.9	116.4	238.0	229.6
Operating income	236.0	213.0	460.8	423.4
Interest expense	(18.9)	(23.1)	(37.7)	(45.6)
Non-operating income (loss), net	1.6	(2.0)	1.9	(1.6)
Income (Loss) from Continuing Operations before Income Taxes, Noncontrolling Interest, Total	218.7	187.9	425.0	376.2
Income tax expense	(51.4)	(40.2)	(100.2)	(78.1)
Net Income	167.3	147.7	324.8	298.1
Other comprehensive income (loss)	0.1	(0.1)	(0.1)	(0.1)
Comprehensive Income	$ 167.4	$ 147.6	$ 324.7	$ 298.0
Basic income (loss) per share
Net Income	$ 1.54	$ 1.31	$ 2.97	$ 2.64
Diluted income (loss) per share
Net Income	$ 1.54	$ 1.31	$ 2.96	$ 2.64
Shares used to compute net income per share
Basic	108.8	112.4	109.5	112.8
Diluted	108.8	112.5	109.6	112.9