Accumulated Other Comprehensive Income (Loss) - Reclassification Adjustments (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Miscellaneous gain, net	$ 2.6	$ 3.5	$ 3.6	$ 6.1
Net actuarial gain (loss) amortized, tax	0.0	(0.2)	(2.1)	(0.7)
Reclassification \| Net prior service benefit
Miscellaneous gain, net	$ 1.9	$ 0.8	$ 6.9	$ 2.1

Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Section 45
-Paragraph 12
-SubTopic 10
-Topic 220
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482790/220-10-45-12

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