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Disaggregation of Revenue (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2021
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | $ 5,373.1 | $ 2,800.7 | $ 9,295.4 | $ 5,097.8 |
Potash Crop Nutrients | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 1,971.4 | 804.8 | 3,166.2 | 1,362.3 |
Phosphate Crop Nutrients | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 1,329.1 | 835.8 | 2,287.9 | 1,502.4 |
Crop Nutrient Blends | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 737.5 | 333.9 | 1,290.5 | 648.6 |
Specialty Products | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 753.2 | 455.4 | 1,369.6 | 854.8 |
Phosphate Rock | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 22.2 | 18.4 | 49.3 | 35.3 |
Other Product Types | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 559.7 | 352.4 | 1,131.9 | 694.4 |
Product |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 5,373.1 | 2,800.7 | 9,295.4 | 5,097.8 |
Brazil |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Canpotexsalesvolumesbygeographypercentage |  |  |  |  | 30.00%
Brazil | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 2,195.0 | 1,014.4 | 3,643.5 | 1,782.2 |
Canpotex [Member] | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 893.8 | 187.3 | 1,386.3 | 337.5 |
Canada | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 271.2 | 228.4 | 501.7 | 418.8 |
India |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Canpotexsalesvolumesbygeographypercentage |  |  |  |  | 6.00%
India | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 144.9 | 73.8 | 144.9 | 103.3 |
China |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Canpotexsalesvolumesbygeographypercentage |  |  |  |  | 11.00%
China | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 244.9 | 116.5 | 465.7 | 242.2 |
Australia | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 39.4 | 0.3 | 64.3 | 24.1 |
Mexico | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 60.5 | 31.9 | 128.4 | 82.1 |
Colombia | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 69.7 | 38.6 | 101.9 | 66.4 |
Paraguay | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 59.9 | 32.6 | 94.9 | 51.6 |
Japan | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 45.3 | 30.2 | 71.8 | 51.9 |
Argentina | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 82.7 | 27.7 | 136.3 | 45.0 |
Honduras | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 20.8 | 8.3 | 24.2 | 11.1 |
Thailand | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 0.8 | 7.7 | 3.1 | 10.8 |
Other Foreign |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Canpotexsalesvolumesbygeographypercentage |  |  |  |  | 39.00%
Other Foreign | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 17.8 | 14.4 | 38.0 | 27.0 |
Total Foreign | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 4,168.3 | 1,828.9 | 6,828.8 | 3,278.0 |
United States | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 1,204.8 | 971.8 | 2,466.6 | 1,819.8 |
DOMINICAN REPUBLIC | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | 11.1 | 3.2 | 13.3 | 9.8 |
INDONESIA |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Canpotexsalesvolumesbygeographypercentage |  |  |  |  | 1400.00%
Peru | Product | Transferred at Point in Time |  |  |  |  |
Disaggregation of Revenue [Line Items] |  |  |  |  |
Net Sales | $ 10.5 | $ 13.6 | $ 10.5 | $ 14.2 |

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