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Financial Instruments and Derivative Financial Instruments - Concentration of Credit Risks (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Financial Instruments and Derivative Financial Instruments
Sales	$ 342.4	$ 357.8	$ 309.6	$ 289.3	$ 290.1	$ 272.2	$ 277.9	$ 244.1	$ 1,299.1	$ 1,084.3	$ 842.9
Geographic Concentration Risk | Sales | Foreign
Financial Instruments and Derivative Financial Instruments
Concentration risk (percent)									47.00%	44.00%	44.00%
Customer Concentration Risk | Sales | Praxair and Linde
Financial Instruments and Derivative Financial Instruments
Concentration risk (percent)										11.20%
Sales										$ 121.6
Customer Concentration Risk | Sales | Ten Largest Customers
Financial Instruments and Derivative Financial Instruments
Concentration risk (percent)									32.00%	39.00%	38.00%

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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