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Stock Compensation Plans (Schedule of Employee Service Share-based Compensation, Allocation of Recognized Costs) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense $ 6.8 $ 2.6
Cost of goods sold    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense 0.3 0.1
Selling, general and administrative expenses    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense $ 6.5 $ 2.5