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Goodwill and Intangible Assets - Components of Intangible Assets (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) |  | 9 years 1 month 6 days | 9 years 10 months 24 days
Gross Carrying Amount |  | $ 542.9 | $ 542.9
Accumulated Amortization |  | $ 247.0 | $ 204.1
Customer Relationships |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) | [1],[2] | 9 years 1 month 6 days | 10 years
Gross Carrying Amount | [1],[2] | $ 503.8 | $ 503.8
Accumulated Amortization | [1],[2] | $ 220.2 | $ 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 |  | $ 23.0 | $ 20.6
Other Intangible Assets |  |  |
Finite Lived Intangible Assets [Line Items] |  |  |
Weighted Average Remaining Useful Life (in Years) |  | 1 year 2 months 12 days | 2 years 1 month 6 days
Gross Carrying Amount |  | $ 4.3 | $ 4.3
Accumulated Amortization |  | $ 3.8 | $ 3.3
[1] | During 2019, a corrugated products facility sold part of its operations which included existing inventory, certain production equipment, and customer relationships corresponding to the operations sold. As a result, the gross carrying amount for the customer relationships intangible asset was decreased by $0.7 million
[2] | 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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