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Weighted-Average Number of Shares Used in Computing Earnings Per Share (Details) - shares
shares in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Weighted average basic shares outstanding (in shares) 12.2 12.2
Plus: Dilutive impact of employee stock awards (in shares) 0.1 0.2
Weighted average diluted shares outstanding (in shares) 12.3 12.4
Antidilutive securities excluded from computation of diluted EPS (in shares) 0.2 0.0