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Employee Retirement Plans - Narrative (Details) $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Mar. 20, 2018 USD ($) element | Jun. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Contribution made |  | $ 1.7 | $ 3.7 |  |  |  |
Contribution made, fixed contributions |  | 1.7 | 3.4 |  |  |  |
Contribution made, profit related contributions |  |  | 0.3 |  |  |  |
Expected contributions |  | 3.9 | 3.9 |  |  |  |
Expected contributions, fixed contributions |  | $ 3.9 | $ 3.9 |  |  |  |
GMSL |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Deferred contribution | $ 12.7 |  |  |  |  |  |
Number of elements | element | 3 |  |  |  |  |  |
Percent of operating profit (equal to) | 10.00% |  |  |  |  |  |
Years in arrears | 2 years |  |  |  |  |  |
Variable contribution, percent of dividends (equal to) | 50.00% |  |  |  |  |  |
GMSL | Scenario, Forecast |  |  |  |  |  |  |
Defined Contribution Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fixed contributions |  |  |  | $ 3.0 | $ 7.0 | $ 6.8 | $ 6.6

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