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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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