Retirement and Postretirement Plans - Summary of Underfunded Pension Benefit Plans (Details) - Underfunded Plan [Member] - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Benefit obligations	$ 1,779.3	$ 2,257.1
Accumulated benefit obligations	1,779.3	2,257.1
Fair value of plan assets	$ 1,562.5	$ 2,152.4

Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level.

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- Definition

Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan.

+ References

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Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ References

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