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Goodwill and Other Intangible Assets - Gross Carrying Amount and Accumulated Amortization (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Definite-lived intangible assets, gross carrying value |  | $ 112.8 |  | $ 112.8 |  | $ 93.8
Accumulated amortization, intangible assets |  | (19.7) |  | (19.7) |  | (13.4)
Definite-lived intangible assets, net carrying value |  | 93.1 |  | 93.1 |  | 80.4
Indefinite-lived intangible assets (excluding goodwill) |  | 72.0 |  | 72.0 |  | 62.7
Total intangible assets, gross carrying value |  | 184.8 |  | $ 184.8 |  | 156.5
Finite-lived intangible asset, useful life |  |  |  | 12 years |  |
Amortization expense |  | 2.4 | $ 2.0 | $ 6.4 | $ 6.1 |
Estimated amortization of intangibles, remainder of 2019 |  | 2.4 |  | 2.4 |  |
Estimated amortization of intangibles, 2020 |  | 9.6 |  | 9.6 |  |
Estimated amortization of intangibles, 2021 |  | 9.6 |  | 9.6 |  |
Estimated amortization of intangibles, 2022 |  | 9.5 |  | 9.5 |  |
Estimated amortization of intangibles, 2023 |  | 9.3 |  | 9.3 |  |
Estimated amortization of intangibles, thereafter |  | 52.7 |  | 52.7 |  |
Intangible assets, net of accumulated amortization of $19.7 and $13.4, respectively |  | 165.1 |  | 165.1 |  | 143.1
Trade names |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | 72.0 |  | 72.0 |  | 62.7
Customer relationships |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Definite-lived intangible assets, gross carrying value | [1] | 108.6 |  | 108.6 |  | 90.9
Accumulated amortization, intangible assets | [1] | (18.2) |  | (18.2) |  | (12.1)
Definite-lived intangible assets, net carrying value | [1] | 90.4 |  | $ 90.4 |  | 78.8
Finite-lived intangible asset, useful life |  |  |  | 12 years |  |
Other |  |  |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Definite-lived intangible assets, gross carrying value | [1] | 4.2 |  | $ 4.2 |  | 2.9
Accumulated amortization, intangible assets | [1] | (1.5) |  | (1.5) |  | (1.3)
Definite-lived intangible assets, net carrying value | [1] | $ 2.7 |  | $ 2.7 |  | $ 1.6
Finite-lived intangible asset, useful life |  |  |  | 8 years |  |
[1] | Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and eight years, respectively. The average useful life across all definite-lived intangible assets is estimated to be approximately 12 years.

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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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