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Plant City and Colonsay Closure Costs (Notes)	12 Months Ended
Plant City and Colonsay Closure Costs (Notes)	Dec. 31, 2021
Plant City and Colonsay Closure Costs [Abstract]
Restructuring, Impairment, and Other Activities Disclosure [Text Block]	MINE CLOSURE COSTS Due to increased brine inflows, on June 4, 2021, the Company made the decision to accelerate the timing of the shutdown of our K1 and K2 mine shafts at our Esterhazy, Saskatchewan potash mine. Closing the K1 and K2 shafts are key pieces of the transition to the K3 shaft, but the timeline for the closure was accelerated by approximately nine months. In 2021, we had pre-tax costs of $158.1 million related to the permanent closure of these facilities. These costs consisted of $109.9 million related to the write-off of fixed assets, $37.1 million related to AROs, and $11.1 million related to inventory and other reserves. In the third quarter of 2021, we resumed production at our previously idled Colonsay potash mine to offset a portion of the production lost by the early closure of the K1 and K2 shafts at Esterhazy. On January 28, 2020, we announced that we intend to keep our Colonsay, Saskatchewan potash mine idled for the foreseeable future. The mine was placed in care and maintenance mode, employing minimal staff and allowing for resumption of operations when needed to meet customers’ needs. For the year ended December 31, 2019, we recorded pre-tax costs of approximately $529.7 million in impairment, restructuring and other expenses in our Consolidated Statement of Earnings (Loss), related to this idling. These costs consisted of approximately $493 million related to the write-off of fixed assets, $27 million related to severance and other employee costs, and $10 million related to the write-off of maintenance, repair, and operating inventories. The write-off is principally the carrying value of the 2013 expansion project, which increased Colonsay’s operating capacity to 2.1 million tonnes. Colonsay had been operating with a modified 1.5 million tonnes capacity since 2016. On June 18, 2019, we announced the permanent closure of the Plant City Facility. We temporarily idled the Plant City Facility in the fourth quarter of 2017, as it was one of our higher cost phosphate facilities. For the year ended December 31, 2019, we recognized pre-tax costs of $341.3 million in impairment, restructuring and other expenses in our Consolidated Statement of Earnings (Loss), related to the permanent closure of this facility. These costs consisted of approximately $210 million related to the write-off of fixed assets, $110 million related to asset retirement obligations and $21 million related to inventory and other reserves.