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Share-based compensation - Dividend equivalent rights - Summary of awards (Details)	Mar. 04, 2021	Mar. 04, 2020	Mar. 07, 2019	Apr. 04, 2018	Jan. 15, 2016	Mar. 06, 2015	Sep. 01, 2014	Mar. 12, 2014
Share-based compensation.
Valuation Method	Black-Scholes	Black-Scholes	Black-Scholes	Black-Scholes	Monte Carlo	Monte Carlo	Monte Carlo	Monte Carlo

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- References

No definition available.

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- Definition

Description of method used to estimate fair value of award under share-based payment arrangement.

+ 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 (f)(1)
-URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901

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