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Earnings Per Share (Details) - shares
shares in Millions
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]      
Weighted average number of shares outstanding - basic 143.0 144.4 143.4
Dilutive effect of employee stock plans 1.4 2.0 1.7
Dilutive effect of stock warrants 0.0 0.0 0.2
Dilutive potential common shares 1.4 2 1.9
Adjusted weighted average shares 144.4 146.4 145.3
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount 0.0 0.2 2.6