Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net income attributable to Chart Industries, Inc.
Income from continuing operations	$ 18.7	$ 21.5	$ 34.0	$ 35.6
Income from discontinued operations, net of taxes	0.0	0.7	0.0	4.7
Net income attributable to Chart Industries, Inc.	$ 18.7	$ 22.2	$ 34.0	$ 40.3
Earnings per common share – basic:
Income from continuing operations, basic (usd per share)	$ 0.52	$ 0.70	$ 1.02	$ 1.15
Income from discontinued operations, basic (usd per share)	0	0.02	0	0.15
Net income attributable to Chart Industries, Inc. (usd per share)	0.52	0.72	1.02	1.30
Earnings per common share – diluted:
Income from continuing operations (usd per share)	0.51	0.65	0.97	1.11
Income from discontinued operations, diluted (usd per share)	0	0.02	0	0.14
Net income attributable to Chart Industries, Inc. (usd per share)	$ 0.51	$ 0.67	$ 0.97	$ 1.25
Weighted average number of common shares outstanding — basic (shares)	35,760	31,030	33,280	30,970
Incremental shares issuable upon assumed conversion and exercise of share-based awards (shares)	380	850	440	830
Incremental shares issuable due to dilutive effect of convertible (shares)	590	930	1,040	340
Incremental shares issuable due to dilutive effect of warrants (shares)	0	140	290	0
Weighted average number of common shares outstanding – diluted (shares)	36,730	32,950	35,050	32,140