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Stock-based compensation (Details) - USD ($) $ in Millions	12 Months Ended
Stock-based compensation (Details) - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common shares issued from treasury stock for stock-based compensation (in shares)	1,433,723	1,972,037	2,497,799
Number of shares authorized under the plans (in shares)	42,500,000
Number of shares available for grant (in shares)	39,336,515
Required minimum age of a participant upon separation from service to meet the criteria for Long Service Separation (in years)	55 years
Minimum term of service to meet criteria for Long Service Separation (in years)	5 years
Requisite service period	6 months
Term life of SARs and option awards (in years)	10 years
Term life of vested options/SARs from separation date (in years)	5 years
Stock-based compensation expense, before tax (in dollars)	$ 242.0	$ 223.0	$ 208.0
Income tax benefit corresponding to stock-based compensation expense	38.0	30.0	33.0
Unrecognized compensation cost related to nonvested stock-based compensation awards (in dollars)	$ 209.1
Term of amortization of unrecognized compensation cost over weighted-average remaining requisite service periods (in years)	1 year 10 months 24 days
Cash tax benefits realized from stock awards exercised	$ 81.0	$ 90.0	$ 89.0
Percentage of award vested on first anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
Percentage of award vested on second anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
Percentage of award vested on third anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Graded vesting period of awards granted	3 years
Outstanding (in shares)	878,830	776,637
Weighted average remaining contractual life (in years)	1 year 8 months 12 days
RSUs \| Percentage of award vested on first anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
RSUs \| Percentage of award vested on second anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
RSUs \| Percentage of award vested on third anniversary of grant date
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Portion of the award vested on each anniversary of the grant date	33.33%
PRSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Cliff vested period of awards granted	3 years
Requisite service period	6 months
Outstanding (in shares)	364,284	390,013
Weighted average remaining contractual life (in years)	1 year 6 months