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Accounting Policies - Carrying Amounts of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 01, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |  |  |  |
Opening balance January 1, 2018 |  | 11,875,492 |  | 11,580,970 |  | $ 11,413,072 |  | $ 11,866,056 |
Financial liabilities at fair value through profit or loss, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | $ 39,799 |  |  |  |  |  |  |  |
Financial liabilities at amortised cost, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 1,716,598 |  |  |  |  |  |  |  |
Other reserves [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI | (352) |  |  |  |  |  |  |  |
Opening balance January 1, 2018 | (317,795) | (322,310) | [1] | (320,569) | [1] | (313,088) | [2] | (298,682) | [2]
Reclassify investments from HTM to FVOCI | 3,126 |  |  |  |  |  |  |  |
Retained earnings [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI | 352 |  |  |  |  |  |  |  |
Opening balance January 1, 2018 | 10,719,205 | 11,116,116 | [3] | 10,718,853 | [3] | $ 10,658,136 |  | $ 11,110,469 |
Reclassify investments from HTM to FVOCI |  |  |  |  |  |  |  |  |
Financial assets at fair value through profit or loss, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 459,460 | 194,927 |  | 1,163,808 |  |  |  |  |
Reclassified bonds and other fixed income from HTM to FVOCI |  |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost | (550,646) |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost | 550,646 |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI | (153,702) |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 11,978 |  | 39,799 |  |  |  |  |
Held-to-maturity investments, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  | 344,336 |  |  |  |  |
Reclassified bonds and other fixed income from HTM to FVOCI | (344,336) |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost |  |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost |  |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |  |  |  |
Financial assets at amortised cost, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 2,092,370 | 2,445,413 |  |  |  |  |  |  |
Reclassified bonds and other fixed income from HTM to FVOCI |  |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost | (550,646) |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost | 550,646 |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  | 1,232,680 |  |  |  |  |  |  |
Financial assets at fair value through other comprehensive income, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 519,610 | 328,635 |  |  |  |  |  |  |
Reclassified bonds and other fixed income from HTM to FVOCI | 344,336 |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost |  |  |  |  |  |  |  |  |
Reclassified fixed income from FVPL to amortized cost |  |  |  |  |  |  |  |  |
Reclassified bonds and other fixed income from FVPL to FVOCI | 153,702 |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 |  |  |  |  |  |  |  |  |
Previously stated [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Opening balance January 1, 2018 |  |  |  | 11,580,970 |  |  |  |  |
Previously stated [member] | Financial liabilities at fair value through profit or loss, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 39,799 |  |  |  |  |  |  |  |
Previously stated [member] | Financial liabilities at amortised cost, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 1,716,598 |  |  |  |  |  |  |  |
Previously stated [member] | Other reserves [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Opening balance January 1, 2018 | (320,569) |  |  | (320,569) | [2] |  |  |  |
Previously stated [member] | Retained earnings [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Opening balance January 1, 2018 | 10,718,853 |  |  | $ 10,718,853 |  |  |  |  |
Previously stated [member] | Financial assets at fair value through profit or loss, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 1,163,808 |  |  |  |  |  |  |  |
Previously stated [member] | Held-to-maturity investments, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 344,336 |  |  |  |  |  |  |  |
Previously stated [member] | Financial assets at amortised cost, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | 1,541,724 |  |  |  |  |  |  |  |
Previously stated [member] | Financial assets at fair value through other comprehensive income, category [member] |  |  |  |  |  |  |  |  |
Statement Line Items [Line Items] |  |  |  |  |  |  |  |  |
Closing balance December 31, 2017 - IAS 39 | $ 21,572 |  |  |  |  |  |  |  |
[1] | Other reserves include mainly the result of transactions with non-controlling interest that do not result in a loss of control, the remeasurement of post-employment benefit obligations, the changes in value of cash flow hedges and in financial instruments measured at fair value through other comprehensive income.
[2] | Other reserves include mainly the result of transactions with non-controlling interest that do not result in a loss of control, the remeasurement of post-employment benefit obligations and the changes in value of cash flow hedges and in available for sale financial instruments.
[3] | The Distributable Reserve and Retained Earnings calculated according to Luxembourg Law are disclosed in Note 24.

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- Definition The amount of assets that are: (a) cash; (b) an equity instrument of another entity; (c) a contractual right: (i) to receive cash or another financial asset from another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially favourable to the entity; or (d) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to receive a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose the entity’s own equity instruments do not include puttable financial instruments classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. [Refer: Financial instruments, class [member]; Financial liabilities] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 25 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_25&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35H -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35H&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35I -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35I&doctype=Standard -URIDate 2017-03-09 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35M -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35M&doctype=Standard -URIDate 2017-03-09 Reference 5: http://www.xbrl.org/2003/role/exampleRef -Note Effective 2018-01-01 -Name IFRS -Number 7 -IssueDate 2017-01-01 -Paragraph 35N -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=7&date=2017-03-01&anchor=para_35N&doctype=Standard -URIDate 2017-03-09 + Details
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