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Pension and Postretirement Health and Life Benefits (Schedule of Fair Value of Plan Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
US Government Securities | $ 16.4 | $ 32.7 |
Corporate Debt | 104.2 | 121.1 |
Municipal Bonds | 2.1 | 2.1 |
Mortgage and asset backed securities | 6.4 | 11.0 |
Fair Value of Investments by Hierarchy Level | 129.1 | 166.9 |
Plan investments measured at NAV | 504.4 | 453.5 |
Accrued Interest Receivable | 1.3 | 1.8 |
Unsettled Transactions Receivable | (1.8) | (1.0) |
Defined Benefit Plan, Plan Assets, Amount | 633.0 | 621.2 |
Pension Plan, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 633.1 | 621.2 | $ 563.5
Other Postretirement Benefits Plan [Member] |  |  |
Defined Benefit Plan, Plan Assets, Amount | 0.0 | 0.0 | $ 0.0
Fair Value, Inputs, Level 2 [Member] |  |  |
US Government Securities | 16.4 | 32.7 |
Corporate Debt | 104.2 | 121.1 |
Municipal Bonds | 2.1 | 2.1 |
Mortgage and asset backed securities | 6.4 | 11.0 |
Fair Value of Investments by Hierarchy Level | $ 129.1 | $ 166.9 |

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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 (b) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 6: 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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