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Investments in Non-Consolidated Companies - MWSPC Joint Venture (Details) t in Millions, $ in Millions |  | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Jul. 01, 2016 USD ($) | Jun. 30, 2014 USD ($) | Dec. 31, 2018 USD ($) t | Dec. 31, 2017 USD ($) financialinstitution | Dec. 31, 2016 USD ($) | Sep. 30, 2018 USD ($) | Apr. 30, 2017 USD ($)
Schedule of Equity Method Investments |  |  |  |  |  |  |
Equity in net (loss) earnings of nonconsolidated companies |  |  | $ (4.5) | $ 16.7 | $ (15.4) |  |
Payments to Acquire Equity Method Investments |  |  | 0.0 | 62.5 | $ 244.0 |  |
Investments in nonconsolidated companies |  |  | 826.6 | 1,089.5 |  |  |
Mosaic investment in MWSPC Joint Venture |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |
Equity in net (loss) earnings of nonconsolidated companies |  |  | $ 9.5 | $ 32.0 |  |  |
Payments to Acquire Equity Method Investments | $ 120.0 |  |  |  |  |  |
Percentage Of Total Production Expected To Market |  |  | 25.00% |  |  |  |
Investments in nonconsolidated companies |  |  | $ 770.0 |  |  |  |
Future Cash Payments To Acquire Interest In Joint Venture |  |  | 70.0 |  |  |  |
Mosaic investment in MWSPC Joint Venture | Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |
Mosaic's exposure in MWSPC credit facility |  | $ 200.0 |  |  |  |  |
Ma'aden Wa'ad Al Shamal Phosphate Company [Member] |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |
Aggregate cost of investment in phosphates greenfield mine including Mosaic's portion |  |  | $ 8,000.0 |  |  |  |
Annual production of finished product (Tonnes) | t |  |  | 3.0 |  |  |  |
Number of lenders in MWSPC credit facility | financialinstitution |  |  |  | 20 |  |  |
MWSPC line of credit facility, maximum borrowing capacity |  | $ 5,000.0 |  |  |  | $ 506.0 | $ 560.0
After project completion, number of months of shareholder tax amounts and severance fees for which the joint venture parties may have exposure |  | 36 months |  |  |  |  |
Loans Payable |  |  |  |  |  |  | $ 1,100.0
Ma'aden Wa'ad Al Shamal Phosphate Company [Member] | Maximum |  |  |  |  |  |  |
Schedule of Equity Method Investments |  |  |  |  |  |  |
Total cash investment from investors to acquire interest in MWSPC |  | $ 2,400.0 |  |  |  |  |

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