Capital Stock - Stock Repurchases (Details) - Class A common stock - Stock repurchase program - USD ($) $ in Millions	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022	Dec. 31, 2011
Stock repurchases
Amount of authorized stock repurchases approved for continuation under the current program			$ 150.0
Shares repurchased under stock repurchase program (in shares)	0	0
Approximate amount of repurchase authority remaining under the current stock repurchase program	$ 17.8