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Basis of Presentation and Significant Accounting Policies - Contributions and Plan Assets (Details) - Pension Plan - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Defined Benefit Plan Disclosure [Line Items]
Projected benefit obligation	$ 16.2	$ 17.2
Qualified Plan \| 401(k) plan assets
Defined Benefit Plan Disclosure [Line Items]
Plan assets	245.7	207.1
Nonqualified Plan
Defined Benefit Plan Disclosure [Line Items]
Plan assets	$ 13.9	$ 13.6

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.

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