Consolidated Balance Sheet Parentheticals - USD ($) shares in Millions, $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Accounts Receivable [Abstract]
Accounts Receivable, Allowance	$ 2.1	$ 2.5
Common Stock [Abstract]
Common Stock, Par Value	$ 0	$ 0
Common Stock, Shares Authorized	80.0	80.0
Common Stock, Shares Outstanding	52.6	52.1
Common Stock, Shares Issued	52.6	52.1

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

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Face amount per share of no-par value 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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