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Employee Benefit Plans (Components of Net Pension Expense) (Details) - Pension Plans [Member] - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Components of Net Pension Expense: |  |  |
Service cost | $ 27.8 | $ 26.7 | $ 19.0
Interest cost | 10.7 | 11.7 | 12.3
Expected return on plan assets | (21.7) | (21.0) | (20.0)
Recognized net actuarial loss | 4.5 | 4.8 | 5.0
Net Pension Expense | $ 21.3 | $ 22.2 | $ 16.3
Assumptions Used to Determine End-of-Year Benefit Obligation: |  |  |
Discount rate | 3.00% | 2.70% | 3.40%
Rate of compensation increase | 4.00% | 4.00% | 5.00%
Cash balance interest crediting rate | 4.00% | 4.00% | 4.00%
Assumptions Used to Determine Net Pension Expense: |  |  |
Discount rate | 2.70% | 3.40% | 4.40%
Rate of compensation increase | 4.00% | 5.00% | 5.00%
Expected return on plan assets | 5.75% | 6.00% | 6.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Cash Balance Interest Crediting Rate | 4.00% | 4.00% | 4.00%

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 3A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 18 -URI http://asc.fasb.org/extlink&oid=123450688&loc=d3e4587-114921 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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