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Commitments and Contingencies d (Details) - USD ($) shares in Millions, $ in Millions | Feb. 03, 2014 | Sep. 30, 2020 | Sep. 30, 2019
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Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Tax settlement deductions under examination |  | $ 1,490.0 |
Decrease in liability from prior year |  | $ 525.0 |
William Russell Grace Asbestos PI Trust and William Russell Grace Asbestos PD Trust |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Original number of shares expected to be issued under settlement agreement adjusted | 18 |  |
Diversey | Guarantee Obligation Under Clawback Agreement |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Contractual obligation |  |  | $ 49.2
North American Foam Trays and Absorbent Pads |  |  |
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] |  |  |
Proceeds from sale of business | $ 929.7 |  |

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