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Employee Benefit Plans (Components of Net Pension (Expense) Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Retirement Benefits [Abstract] |  |  |
Service cost | $ 3.4 | $ 5.3 | $ 5.1
Interest cost | 9.2 | 6.6 | 6.0
Expected return on plan assets | (10.9) | (13.2) | (12.5)
Recognized net actuarial loss | 1.3 | 2.5 | 5.3
Curtailments and settlements | 0.0 | 0.0 | (0.2)
Net pension expense | $ 3.0 | $ 1.2 | $ 3.7
Weighted average assumptions for pension costs: |  |  |
Discount rate | 5.00% | 2.50% | 2.10%
Rate of compensation increase | 3.40% | 3.50% | 3.50%
Expected return on plan assets | 6.40% | 6.00% | 5.90%
Weighted average assumptions for benefit obligation: |  |  |
Discount rate | 4.80% | 5.00% | 2.50%
Rate of compensation increase | 3.40% | 3.40% | 3.50%

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 715 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (k)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480506/715-20-50-1 + Details
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