Stock-Based Compensation (Classification Of Stock-Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 16.3	$ 14.4	$ 44.2	$ 41.0
Share-based Payment Arrangement, Amount Capitalized	0.4	0.5	1.2	1.3
Share-based Payment Arrangement, Expensed and Capitalized, Amount	16.7	14.9	45.4	42.3
Cost Of Revenues [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	1.8	1.6	5.3	4.9
Research And Development [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	2.5	2.2	7.2	6.1
Selling, General And Administrative [Member]
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation	$ 12.0	$ 10.6	$ 31.7	$ 30.0