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Equity-based compensation (Details) - shares shares in Millions	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Share-Based Payment Arrangements [Abstract]
Unvested (in shares)	5.4	4.7
Granted (in shares)	1.8	2.0
Vested (in shares)	(1.1)	(1.0)
Forfeited (in shares)	(0.2)	(0.2)
Unvested (in shares)	5.9	5.5

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- Definition

Share-Based Payment Arrangements [Abstract]

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- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

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The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

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