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Income Taxes (Details 4) $ in Millions, $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2022 CAD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Mar. 31, 2021 USD ($)
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Less: Net earnings attributable to noncontrolling interest |  |  |  |  | $ 591.0 | $ 343.0 | $ 115.0 |
Decrease resulting from prior period tax positions |  |  |  |  |  |  | 9.0 |
Liability (refund) adjustment from settlement with taxing authority |  |  |  |  |  |  | 110.0 |
Transfer pricing arbitration |  |  |  |  | 69.0 | 0.0 | 0.0 |
State income taxes, net of federal |  |  |  |  | 143.0 | 34.0 | (1.0) |
Terra amended tax returns |  |  |  |  | 0.0 | 0.0 | (24.0) |
Interest income |  |  |  |  |  |  | 26.0 |
Income tax expense (benefit) |  |  |  |  | (1,158.0) | (283.0) | (31.0) |
Interest income, net |  |  |  |  |  |  | 23.0 |
Income tax matter |  |  |  |  |  |  | 68.0 |
Withholding tax matter |  |  |  |  |  |  | 42.0 | $ 20.0
Undistributed earnings | $ 12.0 |  |  | $ 12.0 | 12.0 | 0.0 |  |
State tax credits | 7.0 |  |  | 7.0 | 7.0 | 29.0 |  |
Tax credit carryforward decrease during period |  |  |  |  |  | 27.0 |  |
Tax credit carryforwards not expected to be realized |  |  |  |  |  | 18.0 |  |
Deferred tax assets, capital loss carryforwards |  |  |  |  |  |  | 90.0 |
Additions for tax positions taken during prior years |  |  |  |  | 154.0 | 5.0 |  |
Unrecognized tax benefits | 181.0 |  |  | 181.0 | 181.0 | 27.0 | 81.0 |
Unrecognized tax benefits that would impact effective tax rate | 6.0 |  |  | 6.0 | 6.0 |  |  |
Additions for tax positions taken during the current year |  |  |  |  | 0.0 | 0.0 |  |
Reductions related to settlements with tax jurisdictions |  |  |  |  | 0.0 | 59.0 |  |
Interest expense and penalties |  |  |  |  |  |  |  |
Interest expense and penalties related to potential income taxes |  |  |  |  | 66.0 |  | (29.0) |
Accrued interest expense and penalties |  |  |  |  |  |  |  |
Amount recognized in consolidated balance sheets for accrued interest and penalties related to income taxes | 62.0 |  |  | 62.0 | 62.0 | 4.0 |  |
Tax Year 2012 - 2016 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Decrease resulting from prior period tax positions |  |  |  |  |  | 13.0 |  |
Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Liability (refund) adjustment from settlement with taxing authority |  |  |  |  |  | (38.0) |  |
Reductions related to settlements with tax jurisdictions |  |  |  |  |  |  | 12.0 |
State Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Liability (refund) adjustment from settlement with taxing authority |  |  |  |  |  | 12.0 |  |
Operating loss carryforwards | 33.0 |  |  | 33.0 | 33.0 |  |  |
Additions for tax positions taken during the current year |  |  |  |  |  | 5.0 |  |
Foreign Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Operating loss carryforwards | 114.0 |  |  | 114.0 | 114.0 |  |  |
Tax credit carryforward valuation allowance | 44.0 |  |  | 44.0 | 44.0 |  |  |
Unrecognized tax benefits increase in period |  |  |  |  | 26.0 |  |  |
Foreign Tax Authority | Canada Revenue Agency |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Interest income |  |  |  |  |  |  | 10.0 |
Domestic Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Income taxes receivable | 51.0 |  |  | 51.0 | 51.0 |  |  |
Interest income |  |  |  |  |  |  | 16.0 |
Income tax expense (benefit) |  |  |  |  |  |  | (18.0) |
Point Lisas Nitrogen Limited (PLNL) | Foreign Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Change in enacted tax rate |  |  |  |  |  | $ 12.0 | $ 6.0 |
Canada Revenue Agency | State Tax Authority | Tax Years 2006-2011 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
State income taxes, net of federal |  |  |  |  | 9.0 |  |  |
Canada Revenue Agency | Foreign Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Additions for tax positions taken during prior years |  |  |  |  | 154.0 |  |  |
Payments for other taxes | 267.0 | $ 363 |  |  |  |  |  |
Canada Revenue Agency | Foreign Tax Authority | Tax Years 2006-2011 |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Liability (refund) adjustment from settlement with taxing authority | (129.0) |  |  | (129.0) | (129.0) |  |  |
Foreign tax contingency |  |  |  |  | 78.0 |  |  |
Interest on income taxes accrued | 102.0 |  |  | 102.0 | 102.0 |  |  |
Income taxes paid |  |  |  | 224.0 |  |  |  |
Her Majesty's Revenue and Customs (HMRC) | Foreign Tax Authority |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Tax credit carryforward valuation allowance | $ 24.0 |  |  | $ 24.0 | $ 24.0 |  |  |
Interest Income | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Terra amended tax returns |  |  | $ 5.0 |  |  |  |  |
interest income, net | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Terra amended tax returns |  |  | 4.0 |  |  |  |  |
income tax benefit | Internal Revenue Service (IRS) |  |  |  |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |  |  |  |
Terra amended tax returns |  |  | $ 10.0 |  |  |  |  |

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