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Basis of Presentation Basis of Presentation (Details) - USD ($) $ in Millions | Sep. 30, 2021 | May 16, 2021 | Dec. 31, 2020
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Accounts Receivable, Allowance for Credit Loss | $ 9.5 |  | $ 10.9
Discontinued Operations, Held-for-sale | Engineered Materials |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Consideration for discontinued operations |  | $ 360.0 |

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