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Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Disaggregation of Revenue [Line Items]
Net Sales	$ 2,297.1	$ 1,798.1
Potash Crop Nutrients | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	557.5	471.0
Phosphate Crop Nutrients | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	666.6	547.2
Crop Nutrient Blends | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	314.7	287.3
Specialty Products | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	399.4	211.7
Phosphate Rock | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	16.9	6.5
Other Product Types | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	342.0	274.4
Product
Disaggregation of Revenue [Line Items]
Net Sales	2,297.1	1,798.1
Brazil | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	767.8	712.7
Canpotex [Member] | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	150.2	146.4
Canada | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	190.4	117.3
India | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	29.5	37.2
China | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	125.7	39.4
Australia | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	23.8	41.0
Mexico | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	50.2	24.9
Colombia | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	27.8	14.2
Paraguay | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	19.0	16.3
Japan | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	21.7	11.9
Peru | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	0.6	11.4
Argentina | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	17.3	28.0
Honduras | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	2.8	7.0
Thailand | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	3.1	4.4
Other Foreign | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	12.6	24.7
Total Foreign | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	1,449.1	1,236.8
United States | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	848.0	561.3
DOMINICAN REPUBLIC | Product | Transferred at Point in Time
Disaggregation of Revenue [Line Items]
Net Sales	$ 6.6	$ 0.0

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