Other, Net (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2024	Mar. 31, 2023
Other, Net [Abstract]
Interest income	$ 2.5	$ 1.8
AFUDC equity	11.3	4.8
Pension and other postretirement non-service benefit (cost)	(2.2)	(3.5)
Miscellaneous	(2.4)	(1.6)
Other, net	$ 9.2	$ 1.5

Amount of income (expense) related to nonoperating activities, classified as other.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 220
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration