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Intangible Assets | 6 Months Ended
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Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The following table outlines the Company’s identifiable intangible assets:
| June 30, 2016 |  | December 31, 2015
(In millions) | Gross Carrying Amount |  | Accumulated Amortization |  | Gross Carrying Amount |  | Accumulated Amortization
Definite-lived intangibles |  |  |  |  |  |  |
Customer relationships | $ | 1,867.4 |  |  | $ | 251.1 |  |  | $ | 2,017.0 |  |  | $ | 174.4 |
Trade name | 50.2 |  |  | 36.5 |  |  | 51.0 |  |  | 29.1 |
Non-compete agreements | 16.2 |  |  | 8.8 |  |  | 18.7 |  |  | 6.8 |
Carrier relationships | 12.1 |  |  | 12.1 |  |  | 12.1 |  |  | 12.1 |
Other intangible assets | 2.2 |  |  | 2.1 |  |  | 2.2 |  |  | 2.1 |
| $ | 1,948.1 |  |  | $ | 310.6 |  |  | $ | 2,101.0 |  |  | $ | 224.5 |
The range of estimated useful lives and the weighted-average useful lives of the respective intangible assets by type are as follows:
Classification | Estimated Useful Life | Weighted-Average Amortization Period
Customer relationships | 1.5 to 16 years | 13.33 years
Trade names | 1.2 to 3.5 years | 2.86 years
Non-compete agreements | Term of agreement | 4.60 years
Other intangible assets | 1.5 to 5 years | 4.24 years
Intangible asset amortization expense recorded in sales, general and administrative expense was $44.1 million and $29.6 million for the three-month periods ended June 30, 2016 and 2015, respectively, and $86.1 million and $47.6 million for the six-month periods ended June 30, 2016 and 2015, respectively.

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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