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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, 2018
Mar. 31, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation expense $ 9.2 $ 12.0
Cost of goods sold [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation expense 0.8 0.6
Selling, general and administrative expenses [Member]    
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]    
Stock compensation expense $ 8.4 $ 11.4