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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions | 6 Months Ended | 12 Months Ended
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Jun. 30, 2020 | Dec. 31, 2019
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) |  | 9 years 4 months 24 days | 9 years 10 months 24 days
Gross Carrying Amount |  | $ 542.9 | $ 542.9
Accumulated Amortization |  | $ 228.0 | $ 204.1
Customer Relationships |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) | [1] | 9 years 4 months 24 days | 10 years
Gross Carrying Amount | [1] | $ 503.8 | $ 503.8
Accumulated Amortization | [1] | $ 202.7 | $ 180.2
Trademarks and Trade Names |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) |  | 9 years 3 months 18 days | 9 years 6 months
Gross Carrying Amount |  | $ 34.8 | $ 34.8
Accumulated Amortization |  | $ 21.8 | $ 20.6
Other Intangible Assets |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) |  | 1 year 7 months 6 days | 2 years 1 month 6 days
Gross Carrying Amount |  | $ 4.3 | $ 4.3
Accumulated Amortization |  | $ 3.5 | $ 3.3
[1] | During the second quarter of 2020, the Company recorded a $4.5 million adjustment to decrease the remaining book value of the customer relationships intangible asset as a result of the closure of the San Lorenzo, California corrugated products facility.

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- Definition Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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