Business Combinations Hudson Supplemental Pro Forma Information (Details) - Hudson [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Pro Forma Adjustment, nonrecurring acquisition-related expenses incurred by Hudson	$ 16.5
Pro Forma Adjustment, nonrecurring acquisition-related expenses incurred by Chart	9.0
Business Acquisition, Pro Forma Revenue	1,130.0	$ 1,029.0
Business Acquisition, Pro Forma Net Income (Loss)	$ 16.8	$ 17.1
Business Acquisition, Pro Forma Earnings Per Share, Basic	$ 0.55	$ 0.56
Business Acquisition, Pro Forma Earnings Per Share, Diluted	$ 0.54	$ 0.55

Pro Forma Adjustment, nonrecurring acquisition-related expenses incurred by Chart

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- Definition

Pro Forma Adjustment, nonrecurring acquisition-related expenses incurred by Hudson

+ References

No definition available.

+ Details

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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- Definition

The pro forma basic net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(2)-(3)
-URI http://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

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- Definition

The pro forma diluted net income per share for a period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

+ References

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- Definition

The pro forma revenue for a period as if the business combination or combinations had been completed at the beginning of the period.

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