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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts $ 11.1 $ 5.9
Property and equipment, accumulated depreciation $ 375.7 $ 338.0
Preferred stock, authorized (in shares) 15,000,000.0 15,000,000.0
Preferred stock, outstanding (in shares) 0 0
Common stock, authorized (in shares) [1] 100,000,000.0 100,000,000.0
Common stock, issued (in shares) [1] 30,200,000 26,300,000
Common stock, outstanding (in shares) [1] 30,200,000 26,300,000
Class B common stock    
Common stock, authorized (in shares) 25,000,000.0 25,000,000.0
Common stock, issued (in shares) 0 200,000
Common stock, outstanding (in shares) 0 200,000
[1] Prior to June 7, 2021, common stock was classified as Class A common stock. The Class A common stock reclassification as common stock occurred in connection with the elimination of the Company’s classified common stock structure following the conversion of all Class B common stock to Class A common stock.