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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Pension Plan, Defined Benefit [Member] |  |  |  |
Service costs | $ 0.8 | $ 0.9 | $ 1.6 | $ 1.7
Interest costs | 7.6 | 7.2 | 15.2 | 14.4
Expected return on plan assets (gains) | (9.1) | (10.3) | (18.2) | (20.5)
Net periodic benefit cost (credit) | (0.7) | (2.2) | (1.4) | (4.4)
Postretirement Health and Life Benefits Plans [Member] |  |  |  |
Interest costs | 1.5 | 1.5 | 3.0 | 2.9
Amortization of prior service costs (credits), net | 0.0 | (0.1) | (0.1) | (0.1)
Net periodic benefit cost (credit) | $ 1.5 | $ 1.4 | $ 2.9 | $ 2.8

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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets of defined benefit plan. + References Reference 1: 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=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=108410482&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 6 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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