Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Statement [Abstract]
Sales	$ 322.0	$ 289.5	$ 610.5	$ 591.4
Cost of sales	238.8	206.2	443.4	425.8
Gross profit	83.2	83.3	167.1	165.6
Selling, general, and administrative expenses	48.0	43.5	94.2	96.0
Amortization expense	9.6	14.0	18.4	28.0
Operating expenses	57.6	57.5	112.6	124.0
Operating income	25.6	25.8	54.5	41.6
Interest expense, net	2.2	7.6	4.2	14.8
Unrealized loss (gain) on investments in equity securities	12.5	(1.0)	9.2	3.8
Financing costs amortization	1.1	1.1	2.3	2.1
Foreign currency loss and other	1.7	1.2	1.5	1.5
Income from continuing operations before income taxes	8.1	16.9	37.3	19.4
Income tax expense	1.3	2.2	4.4	2.6
Net income from continuing operations	6.8	14.7	32.9	16.8
Income from discontinued operations, net of tax	0.0	6.3	0.0	12.7
Net income	6.8	21.0	32.9	29.5
Less: Income attributable to noncontrolling interests of continuing operations, net of taxes	0.3	0.9	0.8	0.9
Net income attributable to Chart Industries, Inc.	6.5	20.1	32.1	28.6
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
Basic earnings per common share attributable to Chart Industries, Inc.:
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
Diluted earnings per common share attributable to Chart Industries, Inc.
Income from continuing operations (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.	$ 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
Diluted (shares)	40,810	35,310	40,720	35,660
Comprehensive income, net of taxes	$ 14.4	$ 28.9	$ 21.3	$ 27.5
Less: Comprehensive income attributable to noncontrolling interests, net of taxes	0.3	0.9	0.8	0.9
Comprehensive income attributable to Chart Industries, Inc., net of taxes	$ 14.1	$ 28.0	$ 20.5	$ 26.6