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Employee Benefit Plans (Fair Value of Plan Assets) (Details) - Pension Plans [Member] - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Defined Benefit Plan, Plan Assets, Amount | $ 402.3 | $ 388.2 | $ 356.9 | $ 315.8
Defined Benefit Plan, Cash [Member] |  |  |  |
Actual allocation of plan assets, Fixed income | 4.90% | 3.60% |  |
Fixed Income Funds [Member] |  |  |  |
Actual allocation of plan assets, Fixed income | 39.30% | 36.10% |  |
US Equity [Member] |  |  |  |
Actual allocation of plan assets, Fixed income | 35.50% | 38.50% |  |
Foreign equity [Member] |  |  |  |
Actual allocation of plan assets, Fixed income | 20.30% | 21.80% |  |
Fair Value, Inputs, level 2 [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 402.3 | $ 388.2 |  |
Fair Value, Inputs, level 2 [Member] | Defined Benefit Plan, Cash [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 19.8 | 14.1 |  |
Fair Value, Inputs, level 2 [Member] | Fixed Income Funds [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 158.2 | 140.2 |  |
Fair Value, Inputs, level 2 [Member] | US Equity [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | 142.8 | 149.4 |  |
Fair Value, Inputs, level 2 [Member] | Foreign equity [Member] |  |  |  |
Defined Benefit Plan, Plan Assets, Amount | $ 81.5 | $ 84.5 |  |

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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(01) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 4: 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 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(iv)(02) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 Reference 7: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(ii) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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