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Stock Compensation Plans (Schedule of Stock Compensation Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock compensation expense | $ 6.0 | $ 14.2 | $ 21.3 | $ 27.2
Cost of goods sold |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock compensation expense | 0.2 | 0.5 | 0.8 | 0.9
Selling, general and administrative expenses |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Total stock compensation expense | $ 5.8 | $ 13.7 | $ 20.5 | $ 26.3

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