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Restructuring - Restructuring Charges (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ (25.9) | $ (13.4) | $ (8.4)
Gas Cylinders segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (20.7) | (10.0) | (2.9)
Elektron segment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (5.2) | (3.4) | (5.5)
Severance and related costs |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (20.9) | (6.7) | (4.6)
Asset impairment |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | (5.0) | (6.8) | (2.3)
Other |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |
Total restructuring charges | $ 0.0 | $ 0.1 | $ (1.5)

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- Definition Amount of restructuring charges, remediation cost, and asset impairment loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
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