This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

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Segment and Geographic Information - Narratives (Details) $ in Millions		3 Months Ended								12 Months Ended
	Oct. 01, 2020 segment	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) segment	Dec. 31, 2019 USD ($) segment	Dec. 31, 2018 USD ($)
Segment Reporting Information
Number of reportable segments (segment) \| segment	4									4	4
Sales		$ 312.4	$ 273.2	$ 289.6	$ 301.9	$ 321.4	$ 338.0	$ 287.1	$ 269.0	$ 1,177.1	$ 1,215.5	$ 1,003.9
Transaction related costs												2.1
United States
Segment Reporting Information
Sales										576.8	638.0	570.6
China
Segment Reporting Information
Sales										$ 100.7	$ 80.5	$ 101.6
Geographic Concentration Risk \| Sales \| United States
Segment Reporting Information
Concentration risk (percent)										49.00%	52.50%	56.80%
Geographic Concentration Risk \| Sales \| China
Segment Reporting Information
Concentration risk (percent)										8.60%	6.60%	10.10%
Customer Concentration Risk \| Sales \| Praxair and Linde
Segment Reporting Information
Sales												$ 119.9
Concentration risk (percent)												11.90%