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Restructuring Plans - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 7 Months Ended | 9 Months Ended | 12 Months Ended | 16 Months Ended | 19 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Mar. 31, 2020 | Mar. 31, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Mar. 30, 2020
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  |  |  | $ 55.9 |  |  |  |
Restructuring Charges |  | $ 20.1 | $ 24.1 | $ 17.6 |  |  |  |  | $ 130.8 |  | $ 192.6
2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Anticipated Business Combination Savings |  | 180.0 |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | $ 200.0 |  |  |  |  |
Payments for Restructuring |  |  |  |  |  | 150.0 | 69.3 |  |  |  |
Restructuring Charges |  | 11.5 | 20.8 | 13.9 |  |  |  |  | 47.9 |  | 94.1
2018 Rigid Packaging Restructuring Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  |  |  |  |  | $ 95.0 |
Payments for Restructuring |  |  |  |  |  |  | 12.2 |  |  | $ 65.0 |
Restructuring Charges |  | 7.8 | 2.6 | 3.4 |  |  |  |  | 64.1 |  | 77.9
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
Minimum | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 20.0 |  |  |  |  | 20.0 |  |  |  |
Maximum | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 30.0 |  |  |  |  | 30.0 |  |  |  |
Subsequent Event | Minimum | 2018 Rigid Packaging Restructuring Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring | $ 5.0 |  |  |  |  |  |  |  |  |  |
Subsequent Event | Maximum | 2018 Rigid Packaging Restructuring Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring | $ 10.0 |  |  |  |  |  |  |  |  |  |
Restructuring and Related Costs | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | 165.0 |  |  |  |  |
Payments for Restructuring |  |  |  |  |  | 115.0 | 38.3 |  |  |  |
Restructuring and Related Costs | Minimum | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | 10.0 |  |  |  |  | 10.0 |  |  |  |
Restructuring and Related Costs | Maximum | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring and Related Cost, Expected Cost |  | $ 20.0 |  |  |  |  | 20.0 |  |  |  |
Integration Costs | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | 35.0 |  |  |  |  |
Employee Costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  |  |  | 39.0 |  |  |  |
Employee Costs | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | 100.0 |  |  |  |  |
Fixed Asset Related Costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  |  |  | 2.5 |  |  |  |
Fixed Asset Related Costs | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | 30.0 |  |  |  |  |
Other Costs |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Payments for Restructuring |  |  |  |  |  |  | $ 14.4 |  |  |  |
Other Costs | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | 15.0 |  |  |  |  |
Restructuring Related | 2019 Bemis Integration Plan |  |  |  |  |  |  |  |  |  |  |
Restructuring Cost and Reserve [Line Items] |  |  |  |  |  |  |  |  |  |  |
Restructuring Costs |  |  |  |  |  | $ 20.0 |  |  |  |  |

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