Shareholders' Equity - Common Shares in Treasury and Common Shares Outstanding (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward]
Beginning balance outstanding (in shares)	254,500,000	258,900,000
Treasury stock purchases (shares)	5,200,000	5,600,000	3,350,000
Ending balance outstanding (in shares)	251,300,000	254,500,000	258,900,000
Proceeds from treasury stock issued	$ 0.0	$ 0.0	$ 22.0
Shares in Treasury
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward]
Beginning balance in treasury (in shares)	20,434,584	14,717,347	11,313,634
Shares tendered as payment for option rights exercised (in shares)	11,884	10,467	3,861
Shares tendered in connection with vesting of restricted stock units (in shares)	41,867	106,770	124,852
Treasury stock purchases (shares)	5,200,000	5,600,000	3,350,000
Treasury stock sold (in shares)			(75,000)
Ending balance in treasury (in shares)	25,688,335	20,434,584	14,717,347
Shares Outstanding
Reconciliation Of Common Stock And Treasury Stock Balances [Roll Forward]
Beginning balance outstanding (in shares)	254,543,290	258,875,999	261,143,805
Shares issued for exercise of option rights (in shares)	1,879,285	1,081,815	778,075
Shares tendered as payment for option rights exercised (in shares)	(11,884)	(10,467)	(3,861)
Shares issued for vesting of restricted stock units (in shares)	122,276	302,713	357,832
Shares tendered in connection with vesting of restricted stock units (in shares)	(41,867)	(106,770)	(124,852)
Treasury stock purchases (shares)	5,200,000	5,600,000	3,350,000
Treasury stock sold (in shares)			(75,000)
Ending balance outstanding (in shares)	251,291,100	254,543,290	258,875,999