Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income attributable to Chart Industries, Inc.
Income from continuing operations	$ 0.9	$ 4.2
Income from discontinued operations, net of tax	0.0	1.6
Net income attributable to Chart Industries, Inc.	$ 0.9	$ 5.8
Earnings per common share – basic:
Income from continuing operations, basic (usd per share)	$ 0.03	$ 0.14
Income from discontinued operations, basic (usd per share)	0.00	0.05
Net income attributable to Chart Industries, Inc. (usd per share)	0.03	0.19
Earnings per common share – diluted:
Income from continuing operations (usd per share)	0.03	0.13
Income from discontinued operations, diluted (usd per share)	0.00	0.05
Net income attributable to Chart Industries, Inc. (usd per share)	$ 0.03	$ 0.18
Weighted average number of common shares outstanding — basic (shares)	31,570	30,910
Incremental shares issuable upon assumed conversion and exercise of share-based awards (shares)	550	750
Incremental shares issuable due to dilutive effect of convertible (shares)	1,200	0
Incremental shares issuable due to dilutive effect of warrants (shares)	490	0
Weighted average number of common shares outstanding – diluted (shares)	33,810	31,660