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Cash Flow Information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 569.6 $ 42.0    
Restricted cash included in Current Assets 0.1 0.5    
Total cash, cash equivalents, and restricted cash 569.7 42.5 $ 49.4 $ 71.1
Accrued purchases of property and equipment 9.6 29.4 41.3  
Non-cash investing and financing activities related to property acquired under other financing arrangements 1.7 3.3 9.6  
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing 164.2 243.1 245.6  
Income tax payments, net of income tax refunds $ 190.2 $ 107.5 $ 210.0