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Pension Benefits and Other Postretirement Benefits (Additional Information) (Details) |  | 2 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 17, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Jun. 30, 2019 USD ($) | Jun. 30, 2020 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) plan | Jul. 27, 2020 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Number of qualified noncontributory defined benefit plans | plan |  |  |  |  |  |  |  |  | 2 |
Pension assets |  | $ 12,790,000 | $ 12,790,000 | $ 4,173,000 | $ 12,790,000 |  | $ 4,173,000 |  | $ 12,790,000 |
Pension Benefits |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Payment for settlement | $ 123,300,000 | $ 1,300,000 |  |  |  |  |  |  |  |
Lump sum distributions |  |  | $ 38,900,000 |  |  |  |  |  |  |
Settlement charge |  |  |  | 0 | $ (53,200,000) |  |  |  |  |
Pension assets |  |  |  | 9,700,000 |  |  | 9,700,000 |  |  |
Contributions |  |  |  | 0 |  | $ 0 | 0 |  |  |
Pension Benefits | Subsequent Event |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Pension assets |  |  |  |  |  |  |  |  |  | $ 7,400,000
Pension Benefits | Union Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions |  |  |  | $ 0 |  | $ 0 | $ 0 | $ 0 |  |
Pension Benefits | Merged Plan [Member] |  |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Contributions |  |  |  |  |  |  |  | $ 0 |  |

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- Definition Number of Qualified Noncontributory Defined Benefit Plans + References No definition available. + Details
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