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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Accounts receivable, allowance for doubtful accounts	$ 8.4	$ 5.9
Property and equipment, accumulated depreciation	$ 355.6	$ 338.0
Preferred stock, authorized (in shares)	15,000,000.0	15,000,000.0
Preferred stock, outstanding (in shares)	0	0
Class A common stock
Common stock, authorized (in shares)	100,000,000.0	100,000,000.0
Common stock, issued (in shares)	26,600,000	26,300,000
Common stock, outstanding (in shares)	26,600,000	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

X

- Definition

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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