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Earnings per ordinary share (Tables) | 12 Months Ended
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Dec. 31, 2018
Text block [abstract] |
Summary of Earnings Per Ordinary Share |
Continuing and total operations |  | 2018 |  |  | 2017 Restated |  |  | 2016 Restated |
Basic earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 351 |  |  |  | 540 |  |  |  | 456 |
Basic weighted average number of ordinary shares (millions) |  |  | 190 |  |  |  | 193 |  |  |  | 212 |
Basic earnings per ordinary share (cents) |  |  | 184.7 |  |  |  | 279.8 |  |  |  | 215.1 |
Diluted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 351 |  |  |  | 540 |  |  |  | 456 |
Diluted weighted average number of ordinary shares (millions) |  |  | 192 |  |  |  | 194 |  |  |  | 214 |
Diluted earnings per ordinary share (cents) |  |  | 182.8 |  |  |  | 278.4 |  |  |  | 213.1 |
Adjusted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Profit available for equity holders ($m) |  |  | 351 |  |  |  | 540 |  |  |  | 456 |
Adjusting items: |  |  |  |  |  |  |  |  |  |  |  |
System Fund revenues and expenses ($m) |  |  | 146 |  |  |  | 34 |  |  |  | (35 | )
Interest attributable to the System Fund ($m) (note 7) |  |  | (19 | ) |  |  | (13 | ) |  |  | (7 | )
Tax attributable to the System Fund ($m) |  |  | 0 |  |  |  | 3 |  |  |  | 1 |
Exceptional items before tax ($m) (note 6) |  |  | 104 |  |  |  | (4 | ) |  |  | 29 |
Tax on exceptional items ($m) (note 6) |  |  | (22 | ) |  |  | 2 |  |  |  | (12 | )
Exceptional tax ($m) (note 6) |  |  | (5 | ) |  |  | (90 | ) |  |  | — |
Adjusted earnings ($m) |  |  | 555 |  |  |  | 472 |  |  |  | 432 |
Basic weighted average number of ordinary shares (millions) |  |  | 190 |  |  |  | 193 |  |  |  | 212 |
Adjusted earnings per ordinary share (cents) |  |  | 292.1 |  |  |  | 244.6 |  |  |  | 203.8 |
Adjusted diluted earnings per ordinary share |  |  |  |  |  |  |  |  |  |  |  |
Adjusted earnings ($m) |  |  | 555 |  |  |  | 472 |  |  |  | 432 |
Diluted weighted average number of ordinary shares (millions) |  |  | 192 |  |  |  | 194 |  |  |  | 214 |
Adjusted diluted earnings per ordinary share (cents) |  |  | 289.1 |  |  |  | 243.3 |  |  |  | 201.9 |
|  | 2018 millions |  |  | 2017 millions |  |  | 2016 millions |
Diluted weighted average number of ordinary shares is calculated as: |  |  |  |  |  |  |  |  |  |  |  |
Basic weighted average number of ordinary shares |  |  | 190 |  |  |  | 193 |  |  |  | 212 |
Dilutive potential ordinary shares |  |  | 2 |  |  |  | 1 |  |  |  | 2 |
|  |  | 192 |  |  |  | 194 |  |  |  | 214 |

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