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GOODWILL AND OTHER INTANGIBLE ASSETS AND LIABILITIES (Tables) | 3 Months Ended
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Mar. 31, 2017
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule Of Finite-Lived Intangible Assets By Major Class | The following table is a summary of intangible assets as of March 31, 2017 and December 31, 2016:
|  |  | (In Millions)
|  |  | March 31, 2017 |  | December 31, 2016
| Classification |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Definite-lived intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Permits | Other non-current assets |  | $ | 78.7 |  |  | $ | (25.1 | ) |  | $ | 53.6 |  |  | $ | 78.4 |  |  | $ | (24.6 | ) |  | $ | 53.8 |
Total intangible assets |  |  | $ | 78.7 |  |  | $ | (25.1 | ) |  | $ | 53.6 |  |  | $ | 78.4 |  |  | $ | (24.6 | ) |  | $ | 53.8 |

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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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