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Consolidated Balance Sheets (Parentheticals) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Common stock, shares authorized (shares)	150,000,000	150,000,000
Common stock, shares outstanding (shares)	35,799,994	31,363,650
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares issued (shares)	35,799,994	31,363,650
Allowances for doubtful accounts	$ 8.8	$ 8.5

X

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

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Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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