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Segment Information - Reporting information by segment (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Segment Reporting Information      
Number of reportable segments | item 4    
Revenues and segment income by reportable segment      
Total revenues $ 20,443.9 $ 23,179.4 $ 22,785.1
Floor plan interest expense 46.3 84.5 80.9
Other interest expense 119.6 124.2 114.7
Depreciation 115.5 109.6 103.7
Equity in earnings of affiliates 169.0 147.5 134.8
Segment income 707.6 591.5 604.1
Total assets, equity method investments, and capital expenditures by reporting segment      
Total assets 13,247.2 13,942.7  
Equity method investments 1,500.3 1,399.0  
Capital expenditures $ 185.9 245.3 305.6
Retail Automotive Dealership      
Segment Reporting Information      
Number of reportable segments | item 1    
Number of operating segments | item 6    
Revenues and segment income by reportable segment      
Total revenues $ 17,928.8 20,615.8 20,849.2
Retail Automotive Dealership | Operating segments      
Revenues and segment income by reportable segment      
Total revenues 17,928.8 20,615.8 20,849.2
Floor plan interest expense 39.6 74.9 74.9
Other interest expense 114.5 118.4 108.3
Depreciation 103.8 99.1 94.2
Equity in earnings of affiliates 4.4 5.2 5.2
Segment income 443.4 339.9 389.7
Total assets, equity method investments, and capital expenditures by reporting segment      
Total assets 10,352.8 10,960.1  
Equity method investments 77.2 72.1  
Capital expenditures 175.6 231.9 292.6
Retail Commercial Truck Dealership      
Revenues and segment income by reportable segment      
Total revenues 2,060.9 2,050.5 1,374.5
Retail Commercial Truck Dealership | Operating segments      
Revenues and segment income by reportable segment      
Total revenues 2,060.9 2,050.5 1,374.5
Floor plan interest expense 5.6 8.0 4.2
Other interest expense 3.7 3.2 2.4
Depreciation 6.4 5.5 4.3
Segment income 78.2 86.5 62.3
Total assets, equity method investments, and capital expenditures by reporting segment      
Total assets 839.1 1,075.8  
Capital expenditures 7.2 9.9 9.3
Other | Operating segments      
Revenues and segment income by reportable segment      
Total revenues 454.2 513.1 561.4
Floor plan interest expense 1.1 1.6 1.8
Other interest expense 1.4 2.6 4.0
Depreciation 5.3 5.0 5.2
Segment income 21.4 22.8 22.5
Total assets, equity method investments, and capital expenditures by reporting segment      
Total assets 632.2 579.9  
Capital expenditures 3.1 3.5 3.7
Non-Automotive Investments | Operating segments      
Revenues and segment income by reportable segment      
Equity in earnings of affiliates 164.6 142.3 129.6
Segment income 164.6 142.3 $ 129.6
Total assets, equity method investments, and capital expenditures by reporting segment      
Total assets 1,423.1 1,326.9  
Equity method investments $ 1,423.1 $ 1,326.9