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Pension and Postretirement Health and Life Benefits (Schedule of Estimated Future Benefit Payments) (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Pension Plan, Defined Benefit [Member] |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | $ 57.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 56.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 54.8
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 53.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 52.4
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | 245.1
Other Postretirement Benefits Plan [Member] |
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months | 15.3
Defined Benefit Plan, Expected Future Benefit Payment, Year Two | 13.9
Defined Benefit Plan, Expected Future Benefit Payment, Year Three | 13.2
Defined Benefit Plan, Expected Future Benefit Payment, Year Four | 12.6
Defined Benefit Plan, Expected Future Benefit Payment, Year Five | 12.1
Defined Benefit Plan, Expected Future Benefit Payment, Five Fiscal Years Thereafter | $ 49.3

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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=108410482&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=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fourth 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=108410482&loc=d3e1928-114920 + Details
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