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v3.20.2

Fair Value Measurements and Derivative Instruments - Credit Related Contingent Features (Details) $ in Millions | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) derivative
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Subsequent Event [Line Items] |  |
Number of interest rate derivatives requiring collateral to be posted | derivative |  | 7
Debt instrument, collateral amount |  | $ 80.0
Interest Contracts |  |
Subsequent Event [Line Items] |  |
Debt instrument, collateral amount |  | $ 30.5
Scenario, Forecast |  |
Subsequent Event [Line Items] |  |
Debt instrument, collateral amount | $ 60.6 |

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- Definition Number Of Interest Rate Derivatives Requiring Collateral To Be Posted + References No definition available. + Details
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Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

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- Definition Amount of assets pledged to secure a debt instrument. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=75038535&loc=d3e64711-112823 + Details
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Period Type: | instant

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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
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |