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Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2020	Dec. 31, 2019
Common stock, shares, outstanding	113.3	112.6
Preferred Stock [Member]
Preferred stock, par or stated value per share	$ 0.01	$ 0.01
Preferred stock, shares authorized	10.0	10.0
Preferred stock, shares outstanding	0.0	0.0
Series Common Stock [Member]
Common stock, par or stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	40.0	40.0
Common stock, shares, outstanding	0.0	0.0
Common Stock [Member]
Common stock, par or stated value per share	$ 0.01	$ 0.01
Common stock, shares authorized	150.0	150.0
Common stock, shares issued	121.3	120.2
Treasury stock, shares	8.0	7.6

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Face amount or stated value per share of common stock.

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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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