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v3.21.2

Segment Information - Selected Financial Information by Reportable Segment (Parenthetical) (Details) - USD ($) $ in Millions |  | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | ---
May 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 21, 2021
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Adjustment of asset retirement obligation |  |  |  |  |  | $ 9.4 |  |
Restructuring charges |  |  |  |  |  | 0.1 |  |
Goodwill impairment charge |  | $ 0.0 | $ 0.0 |  |  | 0.0 | $ 55.2 |
Senior Notes | 3.05% Senior Notes Due October 2051 |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Debt Refinancing Cost |  | $ 0.5 |  |  |  | $ 0.5 |  |
Stated interest rate |  | 3.05% |  |  |  | 3.05% |  | 3.05%
Paper Reporting Unit |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Goodwill impairment charge | $ 55.2 |  |  | $ 55.2 | $ 55.2 |  |  |
Jackson, Alabama Mill | Corrugated Products Facilities |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Adjustment of asset retirement obligation |  | $ 4.5 |  |  |  |  |  |
San Lorenzo, California [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  | $ 2.7 |  |  |  |  |  |
San Lorenzo, California [Member] | Packaging and Paper |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | 3.3 |  |  |  | 24.1 |
COVID-19 | Packaging and Paper |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Incremental out-of-pocket costs |  |  |  |  |  |  | 6.9 |
Hurricane Laura [Member] | DeRidder Louisiana Mill [Member] |  |  |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |  |  |
Restructuring charges |  |  | $ 10.0 |  |  |  | $ 10.0 |

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