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Retirement Benefits - Components of Net Periodic Benefit Cost (Rationalization) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | [1] | Sep. 30, 2018 | [1] | Jun. 30, 2018 | [1] | Mar. 31, 2018 | [1] | Dec. 31, 2017 | [1] | Sep. 30, 2017 | [1] | Jun. 30, 2017 | [1] | Mar. 31, 2017 | [1] | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions | $ 4,800 | $ 300 | $ 500 | $ 700 | $ 1,300 | $ 600 | $ 3,000 | $ 900 | $ 6,253 | $ 5,826 | $ 19,061
Special Termination Benefits [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  | $ 0 | $ 0 | 2,197
Special Termination Benefits [Member] | LaPorte, Indiana manufacturing facility [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  |  |  | 2,800
Net Curtailment Gain [Member] | LaPorte, Indiana manufacturing facility [Member] |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring, Settlement and Impairment Provisions |  |  |  |  |  |  |  |  |  |  | $ (600)
[1] | The first, second, third and fourth quarters of 2018 include rationalization charges of $0.7 million, $0.5 million, $0.3 million and $4.8 million, respectively. The second quarter of 2018 includes a loss on early extinguishment of debt of $2.5 million.

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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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