Pension and Other Postretirement Benefit Plans - Recurring Fair Value Measures, Activity in Level 3 (Details) - Pension - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2024	Dec. 31, 2023
Activity in Level 3 [Roll Forward]
Fair Value, Beginning of Year	$ 589.0	$ 568.6
Fair Value, End of Year	604.1	589.0
Level 3
Activity in Level 3 [Roll Forward]
Fair Value, Beginning of Year	18.9
Fair Value, End of Year	18.3	18.9
Real Estate
Activity in Level 3 [Roll Forward]
Fair Value, Beginning of Year	18.9
Fair Value, End of Year	18.3	18.9
Real Estate \| Level 3
Activity in Level 3 [Roll Forward]
Fair Value, Beginning of Year	18.9	22.4
Actual Return on Plan Assets	(0.6)	(3.1)
Purchases, Sales, and Settlements – Net	0.0	(0.4)
Fair Value, End of Year	$ 18.3	$ 18.9

Amount, measured using unobservable inputs, of increase (decrease) in plan assets of defined benefit plan from actual return (loss) on assets still held.

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- Definition

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

+ 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
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Reference 4: http://www.xbrl.org/2003/role/disclosureRef
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Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
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-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

Reference 7: http://www.xbrl.org/2003/role/exampleRef
-Topic 715
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
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-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480506/715-20-50-1

+ Details

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- Definition

Amount, measured using unobservable input, of increase (decrease) in plan asset of defined benefit plan from purchase, sale and settlement of trade associated with underlying investment.

+ References

+ Details

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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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- Details

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- Details

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- Details

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