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Restructuring Plans - Restructuring Plan Costs (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended | 19 Months Ended
--- | --- | --- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019 | Mar. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges | $ 20.1 | $ 24.1 | $ 17.6 |  |  |  | $ 130.8 | $ 192.6
2018 Rigid Packaging Restructuring Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges | 7.8 | 2.6 | 3.4 |  |  |  | 64.1 | 77.9
2019 Bemis Integration Plan |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges | 11.5 | 20.8 | 13.9 |  |  |  | 47.9 | 94.1
Restructuring Related Costs | 2.0 | 1.5 | 3.6 |  |  |  | 1.8 |
Other Restructuring Plans |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |
Restructuring Charges | $ 0.8 | $ 0.7 | $ 0.3 | $ 1.5 | $ 1.8 | $ 16.2 | $ 18.8 | $ 20.6

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