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Business Combinations - Pro Forma Information (Details) - AXC
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2019
USD ($)
$ / shares
Business Acquisition, Pro Forma Information  
Pro forma sales | $ $ 1,042.9
Pro forma net income attributable to Chart Industries, Inc. | $ $ 25.8
Pro forma net income attributable to Chart Industries, Inc. per common share, basic (usd per share) | $ / shares $ 0.78
Pro forma net income attributable to Chart Industries, Inc. per common share, diluted (usd per share) | $ / shares $ 0.74