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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Defined Benefit Plan, Accumulated Benefit Obligation | $ 733.8 | $ 817.9
Expected defined benefit plan contributions for next fiscal year for qualified plans | 9.4 |
Expected defined benefit plan contributions for next fiscal year for non-qualified plans | 1.4 |
Expected defined benefit plan contributions for next fiscal year for postretirement health and life benefit plans | 15.3 |
Defined Contribution Plan, Cost | 1.8 | 2.3
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (17.3) | 25.8
Pension Plan, Defined Benefit [Member] |  |
Approximate Number of Plan Participants | 5,000 |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (50.8) | $ 32.8
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.30% | 3.70%
Other Postretirement Benefits Plan [Member] |  |
Approximate Number of Plan Participants | 3,100 |
Defined Benefit Plan, Actuarial (Gain) Loss From Remeasurement | $ (13.1) | $ (24.8)
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.30% | 3.60%

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- Definition Expected defined benefit plan contributions for next fiscal year for non-qualified plans + References No definition available. + Details
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- Definition Expected defined benefit plan contributions for next fiscal year for postretirement health and life benefit plans + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + 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 (e) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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