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Commitments and Contingencies d (Details) - USD ($)
shares in Millions, $ in Millions
Feb. 03, 2014
Sep. 30, 2020
Sep. 30, 2019
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