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Summary of Significant Accounting Policies - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounting Policies [Abstract]
Net sales	$ 12,357.4	$ 8,681.7	$ 8,906.3
Canadian resources taxes and royalties included in cost of goods sold	301.5	176.1	211.9
Assets related to PIS and Cofins and income tax credits in Brazil	112.5
Other Affiliates [Member]
Sales And Receivables [Line Items]
Accounts Receivable, Related Parties	$ 382.5	89.4
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	$ 1,100.0	$ 795.2	$ 952.5

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