Shareholders' Equity (Tables)

12 Months Ended

Dec. 31, 2023

Stockholders' Equity Note [Abstract]

Roll-forward of changes in issued and outstanding Common Shares

The following table presents a roll-forward of changes in Arch Capital’s issued and outstanding Common Shares:

	Year Ended December 31,
	2023	2022	2021
Common Shares:
Shares issued and outstanding, beginning of year	588.3	583.3	579.0
Shares issued (1)	2.8	3.5	2.7
Restricted shares issued, net of cancellations	0.8	1.5	1.6
Shares issued and outstanding, end of year	591.9	588.3	583.3
Common shares in treasury, end of year	(218.5)	(217.9)	(204.4)
Shares issued and outstanding, end of year	373.4	370.4	378.9

(1)    Includes shares issued from the exercise of stock options and stock appreciation rights, the vesting of restricted share units and shares issued from the employee share purchase plan.

Schedule of share repurchases

The Company’s repurchases under the share repurchase program were as follows:

	Year Ended December 31,
	2023		2022		2021
Aggregate cost of shares repurchased	$	—	$	586	$	1,234
Shares repurchased	—		12.9		31.5
Average price per share repurchased	$	—	$	45.44	$	39.20