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Restructuring and Restructuring Related Charges (Summary Of Restructuring-Related Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Restructuring Cost and Reserve [Line Items] |  |  |
Amount of total that represents cash charges | $ 1.4 | $ (0.3) | $ 7.6
Inventory obsolescence and other | 0.0 | 0.0 | 0.3
Total restructuring and restructuring-related costs | $ 1.4 | $ (0.3) | 7.9
COVID-19 |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Severance and other restructuring costs |  |  | $ 6.5

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