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Subsequent events (Details) $ in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Feb. 28, 2019 USD ($) | Apr. 01, 2019 segment | Dec. 31, 2018 segment
Subsequent Event [Line Items] |  |  |
Number of reportable segments | segment |  |  | 7
Subsequent Event |  |  |
Subsequent Event [Line Items] |  |  |
Number of reportable segments | segment |  | 4 |
Subsequent Event | 2019 Footprint Realignment Plan | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | $ 56.0 |  |
Effect on future cash flows, amount | 53.0 |  |
Restrcturing costs, expected capital expenditures | 29.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 70.0 |  |
Effect on future cash flows, amount | 66.0 |  |
Restrcturing costs, expected capital expenditures | 35.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Termination benefits | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 19.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Termination benefits | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 23.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Other Costs | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 1.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Other Costs | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 2.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Restructuring charges | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 20.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Restructuring charges | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 25.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Accelerated Depreciation And Other Costs | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 36.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Accelerated Depreciation And Other Costs | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 45.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Accelerated Depreciation And Other Costs | Cost of Goods Sold | Minimum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | 3.0 |  |
Subsequent Event | 2019 Footprint Realignment Plan | Accelerated Depreciation And Other Costs | Cost of Goods Sold | Maximum |  |  |
Subsequent Event [Line Items] |  |  |
Expected restructuring charges | $ 4.0 |  |

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