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Pension and Postretirement Health and Life Benefits (Narrative) (Details) $ in Millions	9 Months Ended
	Sep. 30, 2021 USD ($)
Gain Related to Litigation Settlement	$ 43.5
Pension Plan, Defined Benefit [Member]
Defined Contribution Plan, Employer Supplemental Contribution Amount	33.8
Other Postretirement Benefits Plan [Member]
Defined Contribution Plan, Employer Supplemental Contribution Amount	$ 9.7

X

- Definition

Amount of discretionary contributions made by an employer to a defined contribution plan.

+ References

No definition available.

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X

- Definition

Amount of gain (loss) recognized in settlement of litigation and insurance claims. Excludes claims within an insurance entity's normal claims settlement process.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349

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