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Retirement Plans and Postretirement Benefit Plans - Summary of Reconciliation of Postretirement Benefit Plans Investments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |
Level 3 Asset Value, Beginning of Period | $ 28.1
Claims paid | (4.8)
Net unrealized losses related to instruments held at the reporting date | (1.8)
Investment fees | (0.1)
Realized losses | (0.6)
Interest income | 0.7
Dividend income | 0.1
Level 3 Asset Value, End of Period | $ 21.6

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Claims Paid + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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