Cash Flow Information (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Dec. 31, 2023
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 97.6		$ 59.8
Restricted cash included in Other Current Assets	26.5		41.7
Restricted cash included in Other Assets	1.9		1.9
Total cash, cash equivalents, and restricted cash	126.0	$ 98.4	$ 103.4	$ 77.0
Accrued purchases of property and equipment	20.3	21.9
Adjustments to right-of-use assets including right-of-use assets obtained in exchange for new operating lease liabilities	108.7	45.6
Adjustments to right-of-use assets including right-of-use assets obtained in exchange for new finance lease liabilities	57.8	26.3
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing	265.0	286.6
Income tax payments, net of income tax refunds	$ 238.0	$ 140.6