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Share-Based Compensation Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 26.3	$ 27.3	$ 28.7
Consideration received from share-based awards	$ 0.0	$ 0.8	$ 1.8
Number of shares granted	0	0	0
Number of shares outstanding	710	762,000	810,000	852,000
Selling and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 26.3	$ 27.3	$ 28.7
Non US
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1.0	1.2	1.6
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period range	1 year
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Performance period range	3 years
Employee Stock Option
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 0.0	0.2	0.5
Share-based payment award vesting period	4 years
Expiration period	10 years
Fair value of options vested	$ 0.7	$ 1.5	$ 2.2
Employee Stock Option \| Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Purchase price (as a percent)	100.00%
Deferred Stock \| In Lieu of Annual Cash Retainer
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Granted (in shares)	7,232	4,716	4,463
Deferred Stock \| Additional Compensation for Board Service
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 1.5	$ 1.7	$ 1.9
Share-based payment award vesting period	1 year
Expiration period	3 years
Granted (in shares)	18,714	14,362	14,721
Restricted Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 19.4	$ 18.9	$ 18.9
Total unrecognized compensation cost, net of estimated forfeitures	$ 13.9
Total unrecognized compensation cost, weighted-average period for recognition	2 years
Granted (in shares)	442,000	343,000	261,000
Forfeited (in shares)	40,000	38,000	44,000
Term for restrictions to lapse	5 years
Restricted Stock \| Additional Compensation for Board Service
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 12,476.0	$ 9,060.0	$ 8,412.0
Performance Shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	5.3	6.1	7.2
Savings Related Share Option Scheme
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation	$ 0.1	$ 0.4	$ 0.2
Purchase price (as a percent)	85.00%