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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Pension Plan, Defined Benefit [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 53.8 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 52.1 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 50.9 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 49.3 |
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 47.9 |
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | $ 223.3 |
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months |  | $ 11.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Two |  | 11.1
Defined Benefit Plan, Expected Future Benefit Payment, Year Three |  | 10.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Four |  | 10.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Five |  | 9.4
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter |  | $ 38.8

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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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