XML 80 R58.htm IDEA: XBRL DOCUMENT
v3.20.1

Fair Value Measurement (Details) $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2015 USD ($) bbl | Mar. 31, 2020 USD ($) | Jan. 31, 2020 USD ($) | Mar. 12, 2019
Level 2 | 5.375% Senior Notes due 2024 |  |  |  |
Fair value measurement |  |  |  |
Debt instrument fair value |  | $ 458 |  |
Level 2 | 5.75% Senior Notes Due 2027 |  |  |  |
Fair value measurement |  |  |  |
Debt instrument fair value |  | 416 |  |
Level 2 | 5.75% Senior Notes Due 2028 |  |  |  |
Fair value measurement |  |  |  |
Debt instrument fair value |  | $ 416 |  |
Recurring | Discount rate | Third-party market participants |  |  |  |
Fair value measurement |  |  |  |
Property and Equipment discount rate |  | 0.190 |  |
Weighted Average | Recurring | Discounted cash flow | Level 3 |  |  |  |
Fair value measurement |  |  |  |
Business comnination cost of capital |  |  |  | 0.141
Weighted Average | Recurring | Discounted cash flow, comparable company and market value | Level 3 |  |  |  |
Fair value measurement |  |  |  |
Goodwill cost of capital |  | 0.180 |  |
Contingent Consideration Period One |  |  |  |
Fair value measurement |  |  |  |
Contingent consideration | $ 125 |  | $ 125 |
Threshold number of barrels of water to trigger contingent consideration payment | bbl | 176,295,000 |  |  |
Contribution Agreement | Contingent Consideration Period Two |  |  |  |
Fair value measurement |  |  |  |
Contingent consideration | $ 125 |  |  |
Threshold number of barrels of water to trigger contingent consideration payment | bbl | 219,200,000 |  |  |

X
- Definition Value of input used to measure goodwill. + References No definition available. + Details
Name: | amgp_GoodwillMeasurementInput
Namespace Prefix: | amgp_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of input used to measure property and equipment. + References No definition available. + Details
Name: | amgp_PropertyAndEquipmentMeasurementInput
Namespace Prefix: | amgp_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the threshold number of barrels of fresh water to be purchased from the entity to trigger a contingent consideration payment. + References No definition available. + Details
Name: | amgp_ThresholdNumberOfBarrelsOfWaterToTriggerContingentConsiderationPayment
Namespace Prefix: | amgp_
Data Type: | num:volumeItemType
Balance Type: | na
Period Type: | duration

X
- Definition For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid. + 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 (c)(3) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Value of input used to measure contingent consideration liability from business combination. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
Name: | us-gaap_BusinessCombinationContingentConsiderationLiabilityMeasurementInput
Namespace Prefix: | us-gaap_
Data Type: | xbrli:decimalItemType
Balance Type: | na
Period Type: | instant

X
- Definition Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 + Details
Name: | us-gaap_DebtInstrumentFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_FairValueLiabilitiesMeasuredOnRecurringBasisUnobservableInputReconciliationLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel2Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=us-gaap_SeniorNotesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=amgp_SeniorNotesDue2027Bearing5.75RateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_CreditFacilityAxis=amgp_SeniorNotesDue2028Bearing5.75RateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByMeasurementFrequencyAxis=us-gaap_FairValueMeasurementsRecurringMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_MeasurementInputTypeAxis=us-gaap_MeasurementInputDiscountRateMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=amgp_ValuationTechniqueThirdPartyMarketParticipantsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=us-gaap_ValuationTechniqueDiscountedCashFlowMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ValuationTechniqueAxis=amgp_ValuationTechniqueDiscountedCashFlowAndComparableCompanyAndMarketValueMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContingentConsiderationByTypeAxis=amgp_ContingentConsiderationPeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TypeOfArrangementAxis=amgp_ContributionConveyanceAndAssumptionAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_ContingentConsiderationByTypeAxis=amgp_ContingentConsiderationPeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |