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Share-based payments (Narrative) (Details)		12 Months Ended
	Aug. 12, 2021 $ / shares	Dec. 31, 2021 USD ($) D item $ / shares shares	Dec. 31, 2020 USD ($) D $ / shares shares	Dec. 31, 2019 USD ($) D $ / shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum employee contribution, percentage		4.00%
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage		50.00%
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Employer matching contribution, percentage		100.00%
Stock Option Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award term		10 years
Remaining shares authorized for grant | shares		4,705,117	6,442,360
Award vesting period		3 years
Weighted average share price of options exercised | $ / shares			$ 51.92	$ 40.32
Weighted average grant date fair value of options granted | $ / shares		$ 12.72	$ 8.69	$ 7.52
Unrecognized compensation costs		$ 6,206,000
Unrecognized compensation costs, period for recognition		2 years 1 month 6 days
Proceeds from exercise of employee stock options		$ 16,250,000	$ 44,128,000	$ 41,094,000
Actual tax benefit realized from option exercise		1,817,000	4,594,000	1,679,000
Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 11,206,000
Unrecognized compensation costs, period for recognition		1 year 8 months 12 days
Market value of shares vested and released		$ 0	$ 0	$ 774,000
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average share price of options exercised | $ / shares		$ 61.40
Number of plans | item		3
Premium Priced Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average estimated grant date fair value | $ / shares		$ 8.59
Unrecognized compensation costs		$ 7,891,000
Unrecognized compensation costs, period for recognition		2 years 9 months 18 days
Performance Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days of volume weighted average price for fair value estimation | D			20	20
Performance Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 5,030,000
Unrecognized compensation costs, period for recognition		2 years 7 months 6 days
Performance Share Units With Market Conditions [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	3 years
Weighted average grant-date fair value of awards | $ / shares	$ 65.45
Award holding period	1 year
Discount value | $ / shares	$ 5.90
Effective tax rate	35.00%
Restricted Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of trading days of volume weighted average price for fair value estimation | D		20
Restricted Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 2,316,000
Unrecognized compensation costs, period for recognition		1 year 8 months 12 days
Deferred Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation costs		$ 0
Number of trading days of volume weighted average price for fair value estimation | D		20
Deferred Share Units [Member] | Senior Executive and Employee Performance Share Unit Plans [Member] | Current Liabilities [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share unit liability		$ 10,056,000	$ 9,597,000

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