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Employee Benefit Plans - Asset Category and Fair Value of Plan Assets (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 53.9 | $ 49.1 | $ 42.8
Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 52.1 | 48.8 |
Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 1.8 | 0.3 | $ 0.2
Equity funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Target Allocations by Asset Category | 68.00% |  |
Fair value of plan assets | $ 38.9 | 36.0 |
Equity funds | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 38.9 | 36.0 |
Equity funds | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 0.0 | 0.0 |
Fixed income funds |  |  |
Defined Benefit Plan Disclosure |  |  |
Target Allocations by Asset Category | 26.00% |  |
Fair value of plan assets | $ 13.2 | 12.8 |
Fixed income funds | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 13.2 | 12.8 |
Fixed income funds | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 0.0 | 0.0 |
Other investments |  |  |
Defined Benefit Plan Disclosure |  |  |
Target Allocations by Asset Category | 6.00% |  |
Fair value of plan assets | $ 1.8 | 0.3 |
Other investments | Level 2 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | 0.0 | 0.0 |
Other investments | Level 3 |  |  |
Defined Benefit Plan Disclosure |  |  |
Fair value of plan assets | $ 1.8 | $ 0.3 |

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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=118255775&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=118255775&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=118255775&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=118257860&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=118255775&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=118255775&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=118255775&loc=d3e1928-114920 + Details
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