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Share-based awards - Summary of RSU and PSU Activity (Details)	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Performance Share Unit (PSUs)
Outstanding Number of Shares
Outstanding at beginning of period (in shares) | shares	159,641
Assumed through business combinations (in shares) | shares	0
Granted (in shares) | shares	55,444
Shares vested (in shares) | shares	(44,132)
Forfeited (in shares) | shares	(4,777)
Outstanding at end of period (in shares) | shares	166,176
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (USD per share) | $ / shares	$ 137.64
Assumed through business combinations (in USD per share) | $ / shares	0
Granted (USD per share) | $ / shares	177.77
Shares vested (USD per share) | $ / shares	115.61
Forfeited (USD per share) | $ / shares	115.61
Outstanding at end of period (USD per share) | $ / shares	$ 159.11
Restricted Stock Units (RSUs)
Outstanding Number of Shares
Outstanding at beginning of period (in shares) | shares	341,424
Assumed through business combinations (in shares) | shares	589,517
Granted (in shares) | shares	159,796
Shares vested (in shares) | shares	(441,328)
Forfeited (in shares) | shares	(48,441)
Outstanding at end of period (in shares) | shares	600,968
Weighted Average Grant Date Fair Value
Outstanding at beginning of period (USD per share) | $ / shares	$ 145.77
Assumed through business combinations (in USD per share) | $ / shares	206.71
Granted (USD per share) | $ / shares	210.64
Shares vested (USD per share) | $ / shares	186.03
Forfeited (USD per share) | $ / shares	180.74
Outstanding at end of period (USD per share) | $ / shares	$ 190.56

X

- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed In Business Cmbination, Weighted Average Grant Date Fair Value

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No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Assumed Through Business Combination

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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- Definition

Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event.

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-Publisher FASB
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-Paragraph 2
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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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-Publisher FASB
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- Definition

The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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-Paragraph 2
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Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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