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Goodwill and Franchise Value (Schedule of Goodwill) (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2008
Goodwill [Roll Forward]      
Balance $ 454,600,000 $ 434,900,000  
Adjustments to purchase price allocations   5,100,000  
Additions through acquisitions 3,200,000 17,400,000  
Reductions from impairments 0 (1,700,000)  
Reductions through divestitures (100,000) (1,100,000)  
Balance 457,700,000 454,600,000  
Accumulated impairment loss     $ 299,300,000
Goodwill acquired including purchase accounting adjustments   22,500,000  
Domestic      
Goodwill [Roll Forward]      
Balance 171,800,000 164,500,000  
Adjustments to purchase price allocations   1,600,000  
Additions through acquisitions 400,000 6,200,000  
Reductions from impairments   (300,000)  
Reductions through divestitures (100,000) (200,000)  
Balance 172,100,000 171,800,000  
Import      
Goodwill [Roll Forward]      
Balance 197,300,000 188,900,000  
Adjustments to purchase price allocations   1,600,000  
Additions through acquisitions 2,400,000 9,000,000.0  
Reductions from impairments   (1,300,000)  
Reductions through divestitures 0 (900,000)  
Balance 199,700,000 197,300,000  
Luxury      
Goodwill [Roll Forward]      
Balance 85,500,000 81,500,000  
Adjustments to purchase price allocations   1,900,000  
Additions through acquisitions 400,000 2,200,000  
Reductions from impairments   (100,000)  
Reductions through divestitures 0 0  
Balance $ 85,900,000 $ 85,500,000