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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, 2019
Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense $ 12.5 $ 9.2
Cost of goods sold    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense 0.5 0.8
Selling, general and administrative expenses    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Total stock compensation expense $ 12.0 $ 8.4