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Goodwill and Identifiable Intangible Assets - Identifiable Intangible Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Identifiable intangible assets |  |  |  |
Gross Carrying Amount | $ 452.5 | $ 452.8 | $ 452.5 |
Accumulated Amortization | 213.1 | 246.8 | 213.1 |
Net | 239.4 | 206.0 | 239.4 |
Total intangible assets, Gross Carrying Amount | 492.9 | 492.2 | 492.9 |
Total intangible assets, Net | 279.7 | 245.4 | 279.7 |
Goodwill and other impairments | 91.9 | 0.0 | 91.9 | $ 0.0
Intangible amortization expense |  | 35.9 | 41.9 | $ 39.7
Trademark/trade name rights |  |  |  |
Identifiable intangible assets |  |  |  |
Indefinite lived intangible assets | 40.3 | 39.4 | 40.3 |
Customer relationships |  |  |  |
Identifiable intangible assets |  |  |  |
Gross Carrying Amount | 373.8 | 373.8 | 373.8 |
Accumulated Amortization | 171.4 | 198.7 | 171.4 |
Net | 202.4 | 175.1 | 202.4 |
Supplier agreements |  |  |  |
Identifiable intangible assets |  |  |  |
Gross Carrying Amount | 38.7 | 39.0 | 38.7 |
Accumulated Amortization | 15.4 | 17.6 | 15.4 |
Net | 23.4 | 21.4 | 23.4 |
Others |  |  |  |
Identifiable intangible assets |  |  |  |
Gross Carrying Amount | 40.0 | 40.0 | 40.0 |
Accumulated Amortization | 26.3 | 30.5 | 26.3 |
Net | $ 13.7 | 9.5 | $ 13.7 |
Marine segment |  |  |  |
Identifiable intangible assets |  |  |  |
Goodwill and other impairments |  | 4.1 |  |
Land segment |  |  |  |
Identifiable intangible assets |  |  |  |
Goodwill and other impairments |  | $ 3.0 |  |

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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