Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Net income attributable to Chart Industries, Inc.
Income from continuing operations	$ 6.5	$ 13.8	$ 32.1	$ 15.9
Income from discontinued operations, net of tax	0.0	6.3	0.0	12.7
Net income attributable to Chart Industries, Inc.	$ 6.5	$ 20.1	$ 32.1	$ 28.6
Earnings per common share – basic:
Income from continuing operations basic (usd per share)	$ 0.18	$ 0.39	$ 0.90	$ 0.45
Income from discontinued operations (usd per share)	0	0.18	0	0.36
Net income attributable to Chart Industries, Inc. (usd per share)	0.18	0.57	0.90	0.81
Earnings per common share – diluted:
Income from continuing operations diluted (usd per share)	0.16	0.39	0.79	0.45
Income from discontinued operations (usd per share)	0	0.18	0	0.35
Net income attributable to Chart Industries, Inc. (usd per share)	$ 0.16	$ 0.57	$ 0.79	$ 0.80
Weighted average number of common shares outstanding — basic (shares)	35,610	35,180	35,580	35,480
Incremental shares issuable upon assumed conversion and exercise of share-based awards (shares)	310	130	320	180
Incremental shares issuable due to dilutive effect of convertible (shares)	2,640	0	2,610	0
Incremental shares issuable due to dilutive effect of warrants (shares)	2,250	0	2,210	0
Weighted average number of common shares outstanding – diluted (shares)	40,810	35,310	40,720	35,660