Cash Flow Information (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 60.3		$ 60.8
Restricted cash included in Other Current Assets	18.9		14.3
Restricted cash included in Other Assets	1.9		1.9
Total cash, cash equivalents, and restricted cash	81.1	$ 83.4	$ 77.0	$ 95.4
Accrued purchases of property and equipment	26.7	33.7
Adjustments to right-of-use assets including right-of-use assets obtained in exchange for new operating lease liabilities	35.2	15.8
Adjustments to right-of-use assets including right-of-use assets obtained in exchange for new finance lease liabilities	6.9	13.5
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing	86.1	58.1
Income tax payments, net of income tax refunds	$ 0.2	$ 0.7