Cash Flow Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]
Cash and cash equivalents	$ 72.6	$ 60.4
Restricted cash included in Current Assets	15.6	0.2
Restricted Cash, Noncurrent	7.2	0.0
Total cash, cash equivalents, and restricted cash	95.4	60.6	$ 569.7	$ 42.5
Accrued purchases of property and equipment	33.0	25.9	9.6
Non-cash investing and financing activities related to property acquired under other financing arrangements			1.7
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing	153.7	113.9	164.2
Income tax payments, net of income tax refunds	$ 482.5	$ 458.3	$ 190.2