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Acquisition of businesses (Tables) | 12 Months Ended
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Dec. 31, 2020
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Summary of Cash Flows Relating to Acquisitions | Cash flows relating to acquisitions
|  | 2020 $m |  |  | 2019 $m |  |  | 2018 $m |
Cash paid on acquisition, including working capital settlement |  |  | — |  |  |  | 299 |  |  |  | 22 |
Settlement of stamp duty liability |  |  | — |  |  |  | 3 |  |  |  | 14 |
Less: cash and cash equivalents acquired |  |  | — |  |  |  | (7 | ) |  |  | (2 | )
Less: working capital settlement received in year following acquisition |  |  | — |  |  |  | (3 | ) |  |  | — |
Net cash outflow arising on acquisitions |  |  | — |  |  |  | 292 |  |  |  | 34 |

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