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Stock compensation - RSU and PSU award activity (Details) - $ / shares	1 Months Ended			9 Months Ended
	Apr. 30, 2019	Jul. 31, 2018	Jun. 30, 2018	Sep. 30, 2019
Shares Subject to Outstanding Options, Shares
Outstanding at the beginning of the period (in shares)				2,043,337
Outstanding at the end of the period (in shares)				2,681,751
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)				$ 80.35
Outstanding at the end of the period (in dollars per share)				$ 79.66
Restricted Stock Units (RSUs)
Shares Subject to Outstanding Options, Shares
Granted (in shares)			190,000	1,132,673
Cancelled (in shares)				(117,233)
Released (in shares)				(572,102)
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Granted (in dollars per share)				$ 83.20
Cancelled (in dollars per share)				84.83
Released (in dollars per share)				$ 87.67
Performance Stock Units (PSUs)
Shares Subject to Outstanding Options, Shares
Granted (in shares)	100,000	77,243	446,500	231,915
Cancelled (in shares)				(23,514)
Released (in shares)				(13,325)
Shares Subject to Outstanding Options, Weighted Average Exercise Price
Granted (in dollars per share)				$ 79.32
Cancelled (in dollars per share)				66.42
Released (in dollars per share)				$ 68.62

X

- Definition

Represents the number of shares of employee compensation programs, other than options, released during the period.

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- Definition

Per share weighted average intrinsic value of equity-based compensation awards released. Excludes stock and unit options.

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

+ References

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-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=116856206&loc=d3e5070-113901

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- Definition

Per share or unit weighted-average intrinsic value of award forfeited under share-based payment arrangement. Excludes share and unit options.

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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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Per share or unit weighted-average intrinsic value of award granted under share-based payment arrangement. Excludes share and unit options.

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

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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