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Schedule II - Valuation and Qualifying Accounts and Reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
DuPont Crop Restructuring      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Write-offs of accounts receivable   $ 42.0  
Reserve for doubtful accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, Beginning of Year $ 87.4 82.9 $ 85.7
Charged to Costs and Expenses 4.7 21.2 71.4
Charged to Other Comprehensive Income 0.0 0.0 0.0
Net recoveries, write-offs and other (39.5) (16.7) (74.2)
Balance, End of Year 52.6 87.4 82.9
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance, Beginning of Year 303.3 261.4 272.0
Charged to Costs and Expenses 34.0 42.2 (8.8)
Charged to Other Comprehensive Income (1.7) (0.3) (1.8)
Net recoveries, write-offs and other 0.0 0.0 0.0
Balance, End of Year $ 335.6 $ 303.3 $ 261.4