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Earnings per ordinary share (Tables) | 12 Months Ended
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Dec. 31, 2019
Text block [abstract] |
Summary of Earnings Per Ordinary Share |
Continuing and total operations |  | 2019 |  |  | 2018 Restated |  |  | 2017 Restated |
Basic earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 385 |  |  |  | 349 |  |  |  | 534 |
Basic weighted average number of ordinary shares (millions) |  |  | 183 |  |  |  | 190 |  |  |  | 193 |
Basic earnings per ordinary share (cents) |  |  | 210.4 |  |  |  | 183.7 |  |  |  | 276.7 |
Diluted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 385 |  |  |  | 349 |  |  |  | 534 |
Diluted weighted average number of ordinary shares (millions) |  |  | 184 |  |  |  | 192 |  |  |  | 194 |
Diluted earnings per ordinary share (cents) |  |  | 209.2 |  |  |  | 181.8 |  |  |  | 275.3 |
Adjusted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 385 |  |  |  | 349 |  |  |  | 534 |
Adjusting items: |  |  |  |  |  |  |  |  |  |  |  |
System Fund revenues and expenses ($m) |  |  | 49 |  |  |  | 146 |  |  |  | 34 |
Interest attributable to the System Fund ($m) |  |  | (18 | ) |  |  | (19 | ) |  |  | (13 | )
Tax attributable to the System Fund ($m) |  |  | — |  |  |  | — |  |  |  | 3 |
Operating exceptional items ($m) (note 6) |  |  | 186 |  |  |  | 104 |  |  |  | (4 | )
Change in fair value of contingent purchase consideration ($m) (note 25) a |  |  | (27 | ) |  |  | 4 |  |  |  | — |
Tax on exceptional items ($m) (note 6) |  |  | (20 | ) |  |  | (22 | ) |  |  | 2 |
Exceptional tax ($m) (note 6) |  |  | — |  |  |  | (5 | ) |  |  | (87 | )
Adjusted earnings ($m) |  |  | 555 |  |  |  | 557 |  |  |  | 469 |
Basic weighted average number of ordinary shares (millions) |  |  | 183 |  |  |  | 190 |  |  |  | 193 |
Adjusted earnings per ordinary share (cents) |  |  | 303.3 |  |  |  | 293.2 |  |  |  | 243.0 |
Adjusted diluted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Adjusted earnings ($m) |  |  | 555 |  |  |  | 557 |  |  |  | 469 |
Diluted weighted average number of ordinary shares (millions) |  |  | 184 |  |  |  | 192 |  |  |  | 194 |
Adjusted diluted earnings per ordinary share (cents) |  |  | 301.6 |  |  |  | 290.1 |  |  |  | 241.8 |
a | Adjusted earnings per ordinary share for 2018 has been restated to exclude the change in fair value of contingent purchase consideration.
|  | 2019 millions |  |  | 2018 millions |  |  | 2017 millions |
Diluted weighted average number of ordinary shares is calculated as: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of ordinary shares |  |  | 183 |  |  |  | 190 |  |  |  | 193 |
Dilutive potential ordinary shares |  |  | 1 |  |  |  | 2 |  |  |  | 1 |
|  |  | 184 |  |  |  | 192 |  |  |  | 194 |

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