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v3.20.2

Subsequent Events (Details) - Forecast - Subsequent Event $ in Millions | 1 Months Ended
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Oct. 31, 2020 USD ($)
Minimum |
Subsequent Event [Line Items] |
Unamortized net unrecognized postretirement benefit costs | $ 45.0
Maximum |
Subsequent Event [Line Items] |
Unamortized net unrecognized postretirement benefit costs | $ 55.0

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- Definition Amount of cost (reversal of cost) for pension and other postretirement benefits. + References No definition available. + Details
Name: | us-gaap_PensionAndOtherPostretirementBenefitExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | srt_StatementScenarioAxis=srt_ScenarioForecastMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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