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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, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets, gross carrying value |  | $ 95.2 | $ 95.2 | $ 1.9
Accumulated amortization |  | (3.6) | (3.6) | (0.5)
Definite-lived intangible assets, net carrying value |  | 91.6 | 91.6 | 1.4
Total intangible assets, gross carrying value |  | 164.7 | 164.7 | 10.7
Total intangible assets, net carrying value |  | 161.1 | $ 161.1 | 10.2
Finite-lived intangible asset, useful life |  |  | 12 years |
Amortization of intangibles |  | 2.2 | $ 3.0 |
Estimated amortization of intangibles, remainder of 2017 |  | 2.2 | 2.2 |
Estimated amortization of intangibles, 2018 |  | 8.7 | 8.7 |
Estimated amortization of intangibles, 2019 |  | 8.7 | 8.7 |
Estimated amortization of intangibles, 2020 |  | 8.1 | 8.1 |
Estimated amortization of intangibles, 2021 |  | 7.7 | 7.7 |
Estimated amortization of intangibles, thereafter |  | 56.2 | 56.2 |
Indefinite-lived intangible assets (excluding goodwill) |  | 69.5 | 69.5 | 8.8
Trade Names |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | 69.5 | 69.5 | 8.8
Customer Relationships |  |  |  |
Finite-Lived and Indefinite-Lived Intangible Assets [Line Items] |  |  |  |
Definite-lived intangible assets, gross carrying value | [1] | 90.9 | 90.9 | 0.8
Accumulated amortization | [1] | (2.7) | (2.7) | (0.1)
Definite-lived intangible assets, net carrying value | [1] | 88.2 | $ 88.2 | 0.7
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] | 4.3 | $ 4.3 | 1.1
Accumulated amortization | [1] | (0.9) | (0.9) | (0.4)
Definite-lived intangible assets, net carrying value | [1] | $ 3.4 | $ 3.4 | $ 0.7
Finite-lived intangible asset, useful life |  |  | 5 years |
[1] | Average useful life of customer relationships and other definite-lived intangible assets are estimated to be approximately 12 years and 5 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://www.xbrl.org/2003/role/presentationRef -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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized in the remainder of the fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + 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)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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