Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Dec. 31, 2022	Dec. 31, 2021
Common stock, shares, outstanding	114.6	114.0
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	123.3	122.5
Treasury stock, shares	8.7	8.5