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Restructuring Activities - Rollforward (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Reserve
Beginning balance, restructuring accrual	$ 0.9	$ 0.9
Restructuring costs	5.2	7.4
Property, plant and equipment impairment		(5.1)
Cash payments and other	(3.3)	(1.3)
Ending balance, restructuring accrual	2.8	1.9
Operating Segments | D&S East
Restructuring Reserve
Beginning balance, restructuring accrual	0.4	0.8
Restructuring costs	1.0	2.4
Property, plant and equipment impairment		(1.9)
Cash payments and other	(0.7)	(0.5)
Ending balance, restructuring accrual	0.7	0.8
Operating Segments | D&S West
Restructuring Reserve
Beginning balance, restructuring accrual	0.1	0.0
Restructuring costs	0.8	0.3
Property, plant and equipment impairment		0.0
Cash payments and other	(0.1)	0.0
Ending balance, restructuring accrual	0.8	0.3
Operating Segments | E&C Cryogenics
Restructuring Reserve
Beginning balance, restructuring accrual	0.2	0.0
Restructuring costs	0.4	3.4
Property, plant and equipment impairment		(3.2)
Cash payments and other	(0.1)	0.5
Ending balance, restructuring accrual	0.5	0.7
Operating Segments | E&C FinFans
Restructuring Reserve
Beginning balance, restructuring accrual	0.0	0.0
Restructuring costs	2.4	1.1
Property, plant and equipment impairment		0.0
Cash payments and other	(2.4)	(1.1)
Ending balance, restructuring accrual	0.0	0.0
Corporate
Restructuring Reserve
Beginning balance, restructuring accrual	0.2	0.1
Restructuring costs	0.6	0.2
Property, plant and equipment impairment		0.0
Cash payments and other	0.0	(0.2)
Ending balance, restructuring accrual	$ 0.8	$ 0.1

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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