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Summary of Significant Accounting Policies - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Accounting Policies [Abstract] |  |  |
Net sales | $ 8,681.7 | $ 8,906.3 | $ 9,587.3
Sales And Receivables [Line Items] |  |  |
Receivables, net | 881.1 | 803.9 |
Canadian resources taxes and royalties included in cost of goods sold | 176.1 | 211.9 | 198.8
Assets related to PIS and Cofins and income tax credits in Brazil | 143.0 |  |
Other Affiliates [Member] |  |  |
Sales And Receivables [Line Items] |  |  |
Receivables, net | $ 89.4 | 1.3 |
Minimum | Machinery and equipment |  |  |
Useful life | 3 years |  |
Minimum | Buildings and Leashold Improvements |  |  |
Useful life | 3 years |  |
Maximum |  |  |
Duration of short term investments in number of days | 90 days |  |
Maximum | Machinery and equipment |  |  |
Useful life | 25 years |  |
Maximum | Buildings and Leashold Improvements |  |  |
Useful life | 40 years |  |
Canpotex |  |  |
Accounting Policies [Abstract] |  |  |
Net sales | $ 795.2 | $ 952.5 | $ 820.1

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