Shareholders' Equity - Shares Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended						6 Months Ended		7 Months Ended	12 Months Ended
	Aug. 08, 2023	Jun. 30, 2023	Mar. 31, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Aug. 08, 2023	Dec. 31, 2022
Equity, Class of Treasury Stock [Line Items]
Repurchases of common stock								$ 26.0	$ 303.0
Common Shares
Equity, Class of Treasury Stock [Line Items]
Shares repurchased (in shares)		453,942	36,369	1,713,416	1,790,395	2,605,947	2,738,223				8,847,981
Repurchases of common stock		$ 24.0	$ 2.0	$ 100.0	$ 97.0	$ 151.0	$ 155.0				$ 503.0
Average price paid per share (in dollars per share)		$ 53.08	$ 62.23	$ 58.34	$ 53.77	$ 58.03	$ 56.62				$ 56.79
Common Shares | Subsequent Event
Equity, Class of Treasury Stock [Line Items]
Remaining capacity of shares repurchase program	$ 158.0									$ 158.0
Shares repurchased (in shares)	320,646									810,957
Repurchases of common stock	$ 19.0									$ 45.0
Average price paid per share (in dollars per share)	$ 58.32									$ 55.56