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Accounting Pronouncements New Accounting Pronouncement (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Jan. 01, 2019
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease, Right-of-Use Asset | $ 40.9 | [1] | $ 34.5
Operating Lease, Liability | $ 45.8 | [2] | $ 39.1
[1] | Included in Property, Plant and Equipment in the 2019 Consolidated Balance Sheet.
[2] | Included in Other Deferred Credits and Other Liabilities in the 2019 Consolidated Balance Sheet.

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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