Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net loss	$ (6.3)	$ (6.0)
Denominator:
Average common shares outstanding (in shares)	90,059,917	88,721,612
Other potentially dilutive common shares (in shares)	0	0
Average common shares outstanding, assuming dilution (in shares)	90,059,917	88,721,612
Basic net loss per share (in dollars per share)	$ (0.07)	$ (0.07)
Diluted net loss per share (in dollars per share)	$ (0.07)	$ (0.07)
Stock option
Denominator:
Antidilutive stock awards excluded from calculation (in shares)	4,000,000.0	5,500,000