Claims, Lawsuits, and Other Contingencies - Legal Narrative (Details) - Fatal Plain Crash In November2016 - Pending Litigation $ in Millions	1 Months Ended					3 Months Ended
	Jun. 30, 2025 USD ($) plaintiff jurisdiction	Dec. 31, 2022 plaintiff	Aug. 31, 2020 USD ($) plaintiff	Nov. 30, 2019 USD ($) defendant	Nov. 30, 2018 USD ($)	Sep. 30, 2025 USD ($)	Dec. 31, 2023 USD ($)
Loss Contingencies [Line Items]
Value of damages sought	$ 16.7		$ 844.0		$ 16.0
Loss contingency, number of defendants | defendant				3
Damages sought option 1				$ 300.0
Damages sought option 2				50.0
Damages sought option 3				$ 25.0
Loss contingency, number of plaintiffs | plaintiff	43	43	43
Loss contingency, number of jurisdictions | jurisdiction	3
Legal settlement expense						$ 23.0	$ 197.0