Stock-Based Compensation (Classification Of Stock-Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 15.7	$ 13.7	$ 29.5	$ 27.9
Share-based Payment Arrangement, Amount Capitalized	0.2	0.5	0.5	0.8
Share-based Payment Arrangement, Expensed and Capitalized, Amount	15.9	14.2	30.0	28.7
Cost Of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2.0	1.8	3.3	3.5
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2.5	2.3	5.0	4.7
Selling, General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 11.2	$ 9.6	$ 21.2	$ 19.7