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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Tables) | 6 Months Ended
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Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule Of Finite-Lived Intangible Assets By Major Class | The following table is a summary of definite-lived intangible assets:
|  |  | (In Millions)
|  |  | June 30, 2018 |  | December 31, 2017
| Classification |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Permits | Other non-current assets |  | $ | 72.2 |  |  | $ | (22.9 | ) |  | $ | 49.3 |  |  | $ | 72.2 |  |  | $ | (22.5 | ) |  | $ | 49.7 |

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- Definition Tabular disclosure of assets, excluding financial assets and goodwill, lacking physical substance with a finite life, by either major class or business segment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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