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Cash Flow Information (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Dec. 31, 2019
Supplemental Cash Flow Information [Abstract]        
Cash and cash equivalents $ 59.5   $ 569.6  
Restricted cash included in Other Current Assets 0.2   0.1  
Total cash, cash equivalents, and restricted cash 59.7 $ 257.4 $ 569.7 $ 42.5
Accrued purchases of property and equipment 12.1 8.7    
Non-cash investing and financing activities related to property acquired under other financing arrangements   0.8    
Adjustments to right-of use assets including right-of-use assets obtained in exchange for new operating lease liabilities 13.0 27.8    
Adjustments to right-of use assets including right-of-use assets obtained in exchange for new finance lease liabilities 17.3 26.6    
Interest payments, net of amounts capitalized and including interest on vehicle inventory financing 63.7 83.5    
Income tax payments, net of income tax refunds $ 190.5 $ 3.2