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Stock-Based Compensation (Nature Of Total 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
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 15.7	$ 13.7	$ 29.5	$ 27.9
Share-based Payment Arrangement, Expensed and Capitalized, Amount	15.9	14.2	30.0	28.7
Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	11.6	10.7	22.5	20.9
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	3.2	2.5	5.3	5.7
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation	$ 1.1	$ 1.0	$ 2.2	$ 2.1

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Amount of noncash expense for share-based payment arrangement.

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