XML 94 R68.htm IDEA: XBRL DOCUMENT
v3.19.1

Goodwill (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Goodwill [Line Items] |  |
Beginning balance | $ 1,693,600,000 | $ 1,630,900,000
Foreign currency translation | (82,300,000) | 62,700,000
Goodwill, Period Increase (Decrease) | 0 |
Ending balance | 1,707,500,000 | 1,693,600,000
Goodwill, Impairment Loss, Net of Tax | 0 |
Goodwill, Acquired During Period | 96,200,000 |
Goodwill determined to be tax deductible | 153,900,000 |
Phosphates Segment [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 492,400,000 | 492,400,000
Foreign currency translation | 0 | 0
Ending balance | 588,600,000 | 492,400,000
Goodwill, Acquired During Period | $ 96,200,000 |
Potash Segment |  |
Goodwill [Line Items] |  |
Percentage of fair value in excess of carrying amount | 18.00% |
Beginning balance | $ 1,076,900,000 | 1,013,600,000
Foreign currency translation | (76,500,000) | 63,300,000
Ending balance | 1,000,400,000 | 1,076,900,000
Mosaic Fertilizantes [Member] |  |
Goodwill [Line Items] |  |
Beginning balance | 124,300,000 | 124,900,000
Foreign currency translation | (5,800,000) | (600,000)
Goodwill, Period Increase (Decrease) | (12,100,000) |
Ending balance | 106,400,000 | $ 124,300,000
Corporate Eliminations And Other Segment [Member] |  |
Goodwill [Line Items] |  |
Goodwill, Period Increase (Decrease) | 12,100,000 |
Ending balance | $ 12,100,000 |
Minimum |  |
Goodwill [Line Items] |  |
Terminal Value Growth Rate | 2.00% |
WACC fifty basis point decrease [Member] | Potash Segment |  |
Goodwill [Line Items] |  |
Percentage of fair value in excess of carrying amount | 24.50% |
WACC twenty-five basis point decrease [Member] | Potash Segment |  |
Goodwill [Line Items] |  |
Percentage of fair value in excess of carrying amount | 21.30% |
WACC twenty-five basis point increase [Member] | Potash Segment |  |
Goodwill [Line Items] |  |
Percentage of fair value in excess of carrying amount | 14.70% |
Scenario, Adjustment [Member] | WACC fifty basis point increase [Member] | Potash Segment |  |
Goodwill [Line Items] |  |
Percentage of fair value in excess of carrying amount | 11.30% |

X
- Definition Terminal Value Growth Rate used in the discounted cash flow method + References No definition available. + Details
Name: | mos_TerminalValueGrowthRate
Namespace Prefix: | mos_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of goodwill arising from a business combination that is expected to be deductible for tax purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessAcquisitionPurchasePriceAllocationGoodwillExpectedTaxDeductibleAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=77989000&loc=SL49117168-202975 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=99380562&loc=d3e13770-109266 + Details
Name: | us-gaap_Goodwill
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillAcquiredDuringPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount after tax of loss recognized that results from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References No definition available. + Details
Name: | us-gaap_GoodwillImpairmentLossNetOfTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_GoodwillLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillPeriodIncreaseDecrease
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of increase (decrease) from foreign currency translation adjustments and purchase accounting adjustments of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 16 -URI http://asc.fasb.org/extlink&oid=84229725&loc=d3e961-128460 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=108376223&loc=d3e13816-109267 + Details
Name: | us-gaap_GoodwillTranslationAndPurchaseAccountingAdjustments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Percentage of fair value of reporting unit in excess of carrying amount. + References No definition available. + Details
Name: | us-gaap_ReportingUnitPercentageOfFairValueInExcessOfCarryingAmount
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mos_PhosphatesSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mos_PotashSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mos_MosaicFertilizantesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementBusinessSegmentsAxis=mos_CorporateEliminationsAndOtherSegmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mos_SensitivityAnalysisAxis=mos_WACCfiftybasispointdecreaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mos_SensitivityAnalysisAxis=mos_WACCtwentyfivebasispointdecreaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mos_SensitivityAnalysisAxis=mos_WACCtwentyfivebasispointincreaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_StatementScenarioAxis=us-gaap_ScenarioAdjustmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | mos_SensitivityAnalysisAxis=mos_WACCfiftybasispointincreaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |