Retirement and Postretirement Benefit Plans (Schedule of Estimated Future Benefit Payments) (Details) - Pension Plan [Member]	Sep. 30, 2020 USD ($)
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
Defined Benefit Plan, Expected Future Benefit Payment, Next Twelve Months	$ 12,000,000.0
Defined Benefit Plan, Expected Future Benefit Payment, Year Two	13,100,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Three	13,900,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Four	14,900,000
Defined Benefit Plan, Expected Future Benefit Payment, Year Five	15,500,000
Defined Benefit Plan, Expected Future Benefit Payment, after Year Five for Next Five Years	$ 90,500,000

No definition available.

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- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-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 benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

+ References

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Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

+ References

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- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

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