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Subsequent Events (Details) - Pension Plans $ in Millions		3 Months Ended				9 Months Ended
	Oct. 14, 2021 USD ($) retiree	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)
Subsequent Event [Line Items]
Settlement losses			$ 0.0		$ 0.0	$ 368.7	$ 0.0
United States
Subsequent Event [Line Items]
Settlement losses			$ 0.0	$ 158.0	$ 0.0	$ 158.0	$ 0.0
Forecast | United States
Subsequent Event [Line Items]
Settlement losses		$ 130.0
Subsequent Event | United States
Subsequent Event [Line Items]
Agreement with insurance company, group annuity contract purchase amount	$ 235.0
Agreement with insurance company, number of retirees | retiree	6,900

X

- Definition

Defined Benefit Plan, Agreement To Transfer Projected Benefit Obligations, Group Annuity Contract, Purchase Amount

+ References

No definition available.

+ Details

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X

- Definition

Defined Benefit Plan Agreement To Transfer Projected Benefit Obligations Number Of Retirees

+ References

No definition available.

+ Details

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X

- Definition

Amount of gain (loss) recognized in net periodic benefit (cost) credit from irrevocable action relieving primary responsibility for benefit obligation and eliminating risk related to obligation and assets used to effect settlement.

+ 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 (h)(7)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 45
-Paragraph 3A
-URI http://asc.fasb.org/extlink&oid=123453770&loc=SL108413299-114919

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)(7)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e2709-114920

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X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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