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Franchising Operating Rights and Goodwill - Roll forward (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Franchise Operating Rights        
Balance at beginning of period $ 278.3 $ 457.0 $ 278.3 $ 585.1
Impairment charge (131.7) (259.8)
Balance at end of period 278.3 325.3 278.3 325.3
Goodwill        
Balance at beginning of period 225.1 225.1 225.1 225.1
Impairment charge   0.0   0.0
Balance at end of period $ 225.1 $ 225.1 $ 225.1 $ 225.1