Weighted-Average Number of Shares Used in Computing Earnings Per Share (Details) - shares shares in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Weighted average basic shares outstanding (in shares)	12.0	12.2	12.1	12.2
Plus: Dilutive impact of employee stock awards (in shares)	0.0	0.1	0.0	0.2
Weighted average diluted shares outstanding (in shares)	12.0	12.3	12.1	12.4
Antidilutive securities excluded from computation of diluted EPS (in shares)	0.5	0.1	0.3	0.1