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Equity Incentive Programs (Schedule of Stock Option Exercises and Vesting Activity) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Proceeds from stock options exercised $ 4.2 $ 2.6 $ 30.3
Stock Options      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total intrinsic value of stock options exercised 3.7 1.7 12.4
Proceeds from stock options exercised 4.2 2.6 30.3
Total grant date fair value of stock options vested $ 0.0 $ 0.0 $ 0.3