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Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 3,418.6	$ 2,381.5	$ 8,516.4	$ 6,224.3
Potash Crop Nutrients | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	942.2	727.3	2,304.5	1,856.3
Phosphate Crop Nutrients | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	950.7	677.0	2,453.1	1,783.8
Crop Nutrient Blends | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	572.1	376.5	1,220.7	915.8
Specialty Products | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	523.3	361.3	1,378.1	914.2
Phosphate Rock | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	21.1	14.5	56.4	28.5
Other Product Types | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	409.2	224.9	1,103.6	725.7
Product
Disaggregation of Revenue [Line Items]
Net Sales	3,418.6	2,381.5	8,516.4	6,224.3
Brazil
Disaggregation of Revenue [Line Items]
Canpotexsalesvolumesbygeographypercentage					25.00%
Brazil | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	1,714.2	1,109.7	3,496.4	2,579.4
Canpotex [Member] | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	268.4	192.8	605.9	555.0
Canada | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	107.0	122.2	525.8	376.9
India
Disaggregation of Revenue [Line Items]
Canpotexsalesvolumesbygeographypercentage					10.00%
India | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	65.0	104.0	168.3	242.0
China
Disaggregation of Revenue [Line Items]
Canpotexsalesvolumesbygeographypercentage					22.00%
China | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	70.9	96.8	313.1	210.7
Australia | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	0.0	10.6	22.9	51.9
Mexico | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	3.9	23.5	86.0	71.2
Colombia | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	40.9	21.1	107.3	61.1
Paraguay | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	36.4	28.3	88.0	71.0
Japan | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	20.7	15.9	72.6	60.4
Peru | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	11.1	26.1	25.3	32.1
Argentina | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	37.6	36.9	82.6	120.0
Honduras | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	6.0	4.3	17.1	21.8
Thailand | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	5.1	4.8	15.9	13.9
Other Foreign
Disaggregation of Revenue [Line Items]
Canpotexsalesvolumesbygeographypercentage					35.00%
Other Foreign | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	24.0	12.4	52.2	54.2
Total Foreign | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	2,421.3	1,814.2	5,699.3	4,534.4
United States | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	997.3	567.3	2,817.1	1,689.9
DOMINICAN REPUBLIC | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	$ 10.1	$ 4.8	$ 19.9	$ 12.8
INDONESIA
Disaggregation of Revenue [Line Items]
Canpotexsalesvolumesbygeographypercentage					8.00%

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