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Commitments and Contingencies Marshalltown Tornado and Recovery (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended | 18 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Insurance recoveries received for property damage incurred from natural disaster |  |  |  | $ 0.0 | $ 79.6 | $ 10.9 |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | (3.1) | 178.8 | 38.3 |
Insurance Recoveries |  |  |  | 0.0 | 243.2 | 124.3 | $ 367.5
Write-off of property, plant and equipment |  |  |  |  |  | 4.0 |
Gain from insurance recoveries, net of losses incurred | $ 93.4 | $ 7.1 | $ 31.9 |  | 46.4 |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | 3.1 | (178.8) | (38.3) |
Insurance recoveries received |  |  |  | 0.0 | 243.2 | 124.3 | $ 367.5
Write-off of property, plant and equipment |  |  |  |  |  | 4.0 |
Gain from insurance recoveries, net of losses incurred | $ 93.4 | $ 7.1 | $ 31.9 |  | 46.4 |  |
Insurance recoveries received for property damage incurred from natural disaster |  |  |  | 0.0 | 79.6 | 10.9 |
Marshalltown Tornado [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Insurance recoveries received for property damage incurred from natural disaster |  |  |  | 3.0 | (79.6) | (10.9) |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | (3.0) | 178.8 | 38.3 |
Insurance Recoveries |  |  |  | 0.0 | 243.2 | 124.3 |
Write-off of inventory |  |  |  | 0.0 | 0.0 | 5.8 |
Write-off of property, plant and equipment |  |  |  | 0.0 | 0.0 | 4.2 |
Factory inefficiencies |  |  |  | 0.0 | 9.3 | 7.4 |
Gain from insurance recoveries, net of losses incurred |  |  |  | 3.0 | (178.8) | (38.3) |
Insurance proceeds for lost profits |  |  |  | 0.0 | (99.2) | (27.4) |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | 3.0 | (178.8) | (38.3) |
Insurance recoveries received |  |  |  | 0.0 | 243.2 | 124.3 |
Write-off of inventory |  |  |  | 0.0 | 0.0 | 5.8 |
Write-off of property, plant and equipment |  |  |  | 0.0 | 0.0 | 4.2 |
Factory inefficiencies |  |  |  | 0.0 | 9.3 | 7.4 |
Gain from insurance recoveries, net of losses incurred |  |  |  | 3.0 | (178.8) | (38.3) |
Insurance proceeds for lost profits |  |  |  | 0.0 | (99.2) | (27.4) |
Insurance recoveries received for property damage incurred from natural disaster |  |  |  | 3.0 | (79.6) | (10.9) |
Site clean-up and remediation |  |  |  | 0.0 | 20.4 | 50.9 |
Other Nonrecurring Expense |  |  |  | 3.0 | 34.7 | 17.7 |
Total expense due to natural disaster |  |  |  | 3.0 | 64.4 | 86.0 |
Marshalltown Wind Storm [Member] |  |  |  |  |  |  |
Commitments and Contingencies Disclosure [Abstract] |  |  |  |  |  |  |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | (0.1) | 0.0 | 0.0 |
Insurance Recoveries |  |  |  | 6.6 |  |  |
Write-off of inventory |  |  |  | 0.1 |  |  |
Building And Building Improvement |  |  |  | 3.0 |  |  |
Factory inefficiencies |  |  |  | 0.2 |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Loss(gain) from natural disaster, net of Insurance recoveries |  |  |  | 0.1 | $ 0.0 | $ 0.0 |
Insurance recoveries received |  |  |  | 6.6 |  |  |
Write-off of inventory |  |  |  | 0.1 |  |  |
Building And Building Improvement |  |  |  | 3.0 |  |  |
Factory inefficiencies |  |  |  | 0.2 |  |  |
Site clean-up and remediation |  |  |  | 1.7 |  |  |
Other Nonrecurring Expense |  |  |  | 1.7 |  |  |
Total expense due to natural disaster |  |  |  | $ 6.7 |  |  |

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