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Acquisition of Mosaic Fertilizantes P&K S.A. (Details) $ / shares in Units, $ in Millions |  |  |  | 3 Months Ended | 12 Months Ended |
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Jan. 08, 2018 USD ($) $ / shares shares | Dec. 28, 2017 USD ($) shares | Dec. 19, 2016 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares | Dec. 31, 2017 USD ($) $ / shares | Dec. 31, 2016 USD ($) | Dec. 31, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Long-term receivable |  |  |  |  | $ 91.7 | $ 0.0 |  |
Recoverable taxes |  |  |  |  | 352.7 | 492.1 |  |
Indemnification asset |  |  |  |  | 30.7 | 0.0 |  |
Business Acquisition, Pro Forma Revenue |  |  |  |  |  | 8,605.7 |  |
Payments to Acquire Businesses, Gross |  |  |  |  | $ 985.3 | $ 0.0 | $ 0.0 |
Common Stock, Par or Stated Value Per Share | $ / shares |  |  |  |  | $ 0.01 | $ 0.01 |  |
Goodwill, Acquired During Period |  |  |  |  | $ 96.2 |  |  |
Business Acquisition, Pro Forma Net Income (Loss) |  |  |  |  |  | $ (43.3) |  |
Business Acquisition, Pro Forma Earnings Per Share, Basic | $ / shares |  |  |  |  |  | $ (0.11) |  |
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares |  |  |  |  |  | $ (0.11) |  |
Miski Mayo Mine |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  | 35.00% |  |
Vale Fertilizantes S.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Long-term receivable | $ 116.3 |  |  |  |  |  |  |
Recoverable taxes | 101.6 |  |  |  |  |  |  |
Indemnification asset | 37.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets | 638.1 |  |  |  |  |  |  |
Payments to Acquire Businesses, Gross | $ 1,080.0 | $ 1,150.0 | $ 1,250.0 |  |  |  |  |
Business acquisition - noncash consideration | shares | 34,176,574 | 34,176,574 | 42,286,874 |  |  |  |  |
Common Stock, Par or Stated Value Per Share | $ / shares | $ 0.01 |  |  |  |  |  |  |
Share Price | $ / shares | $ 26.92 |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Noncurrent |  |  |  |  | 12.4 |  |  |
Business Combination, Contingent Consideration, Liability, Noncurrent Expiration |  |  |  |  | 130.0 |  |  |
Number of phosphate rock mines acquired | 5 |  |  |  |  |  |  |
Number of chemical plants acquired | 4 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment | $ 2,503.2 |  |  |  |  |  |  |
Goodwill, Acquired During Period | 96.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets Noncurrent | 48.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities Noncurrent | 128.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Asset Retirement Obligations | 247.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets | 292.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets | 3,578.0 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Long-term Debt | 6.7 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities | 98.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable | 373.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities | 478.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | 64.6 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other | 215.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities | 1,133.7 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 2,444.3 |  |  |  |  |  |  |
Noncontrolling Interest, Increase from Business Combination | (453.0) |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents | 86.0 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables | 100.3 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Inventory | 344.2 |  |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other | 107.6 |  |  |  |  |  |  |
Business Combination, Consideration Transferred, Other | $ 1,905.3 |  |  |  |  |  |  |
Business Combination, Acquisition and Integration costs |  |  |  |  | 45.3 | $ 26.2 |  |
Business Combination, Separately Recognized Transactions, Revenues and Gains Recognized |  |  |  |  | 1,300.0 |  |  |
Business Combination, Separately Recognized Transactions, Net Gains and Losses |  |  |  |  | 83.6 |  |  |
Vale Fertilizantes S.A. [Member] | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Addition To Board Of Directors | 2 |  |  |  |  |  |  |
Vale Fertilizantes S.A. [Member] | Estimate | Maximum |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Combination, Contingent Consideration, Liability, Noncurrent |  |  |  |  |  |  |  | $ 260.0
Miski Mayo Joint Venture [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 40.00% |  |  |  |  |  |  |
Business Combination, Step Acquisition, Equity Interest in Acquiree, Including Subsequent Acquisition, Percentage | 75.00% |  |  |  |  |  |  |
Brazil Landco [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Business Acquisition, Percentage of Voting Interests Acquired | 49.00% |  |  |  |  |  |  |
Vale Fertilizantes S.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Costs and Expenses, Related Party |  |  |  | $ 11.1 |  |  |  |
Phosphates Segment [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | 96.2 |  |  |
Phosphates Segment [Member] | Vale Fertilizantes S.A. [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Goodwill, Acquired During Period |  |  |  |  | $ 96.2 |  |  |
Brazil Landco [Member] |  |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners | 51.00% |  |  |  |  |  |  |

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