Significant Accounting Policies (Gain on Asset Dispositions) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Property, Plant and Equipment [Abstract]
Residual sharing income	$ (0.5)	$ (0.5)	$ (0.9)
Non-remarketing disposition gains	(21.1)	(15.8)	(11.1)
Asset impairments	(3.6)	0.0	(1.5)
Net gain on asset dispositions	136.9	138.3	130.3
Disposition Gains on Owned Assets	$ 118.9	$ 122.0	$ 119.8

Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill.

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