Stock-Based Compensation (Nature Of Total Stock-Based Compensation) (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 15.9	$ 14.3	$ 33.4	$ 29.4
Share-based Payment Arrangement, Amount Capitalized	0.3	0.3	0.5	0.5
Share-based Payment Arrangement, Expensed and Capitalized, Amount	16.2	14.6	33.9	29.9
Cost Of Revenues [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2.2	2.0	4.3	4.0
Research And Development [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2.8	2.8	5.6	5.4
Selling, General And Administrative [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	10.9	9.5	23.5	20.0
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	12.9	11.9	25.9	24.0
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	2.4	1.6	6.2	3.7
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 0.9	$ 1.1	$ 1.8	$ 2.2

Amount of cost capitalized for award under share-based payment arrangement.

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