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Supplementary Financial Information - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020
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Offsetting [Abstract] |  |
Right of use asset | $ 72.2 | $ 39.8
Other | 4.5 | 2.4
Total other non-current assets | $ 76.7 | $ 42.2

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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=123391704&loc=SL77918627-209977 + Details
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