Pension and Postretirement Benefits - Underfunded or Unfunded Accumulated Benefit Obligation and Related Projected Benefit Obligation (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Postemployment Benefits [Abstract]
Accumulated benefit obligation	$ 1,391.7	$ 1,375.3
Fair value of plan assets	1,257.9	1,227.5
Unfunded accumulated benefit obligation	133.8	147.8
Projected benefit obligation	$ 1,398.2	$ 1,381.7

Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Unfunded Accumulated Benefit Obligation

No definition available.

+ Details

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of accumulated benefit obligation for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480482/715-20-55-17

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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Balance Type:	credit
Period Type:	instant

- Definition

Amount of plan asset for defined benefit plan with accumulated benefit obligation in excess of plan assets.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of projected benefit obligation for defined benefit pension plan with accumulated benefit obligation in excess of plan assets.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480506/715-20-50-3

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Balance Type:	credit
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- References

No definition available.

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