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Schedule II - Condensed Financial Information of Registrant Balance Sheets (Details) - USD ($) $ / shares in Units, $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
--- | --- | --- | --- | --- | ---
ASSETS |  |  |  |  |
Trading Securities | $ 1,649,300 | $ 1,265,700 |  |  |
Cash and cash equivalents (including cash within consolidated variable interest entities of — $166.6 and $291.3) | 1,054,800 | 1,273,800 | $ 1,099,500 | $ 1,178,500 |
Other assets | 500 | 1,000 |  |  |
Total assets | 12,906,400 | 12,090,100 |  |  |
LIABILITIES |  |  |  |  |
Accrued expenses and other payables | 455,400 | 469,200 |  |  |
Long-term debt | 549,500 | 549,300 |  |  |
Total liabilities | 9,977,900 | 8,441,800 |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
59,474,085 shares of par value 0.15144558¢ each (December 31, 2016 — 59,774,464) | 90 | 91 |  |  |
Additional paid in capital | 954,700 | 1,259,600 |  |  |
Retained earnings | 2,026,900 | 2,392,300 |  |  |
Non-controlling interest | 2,700 | 1,400 |  |  |
Total accumulated other comprehensive (loss)/income | (55,900) | (5,100) | $ 59,600 |  |
Total liabilities and shareholders’ equity | $ 12,906,400 | $ 12,090,100 |  |  |
Ordinary shares, issued | 59,474,085 | 59,774,464 | 60,918,373 |  |
Ordinary shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
Preference shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
5.950% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 11,000,000 | 11,000,000 |  |  |
Preference shares, rate | 5.95% | 5.95% |  |  |
Preference shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
7.401% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 0 | 5,327,500 |  |  |
Preference shares, rate |  | 7.401% |  |  |
Preference shares, par value |  | $ 0.0015144558 |  |  |
7.250% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 0 | 6,400,000 |  |  |
Preference shares, rate |  | 7.25% |  |  |
Preference shares, par value |  | $ 0.0015144558 |  |  |
5.625% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 10,000,000 | 10,000,000 |  |  |
Preference shares, rate | 5.625% | 5.625% |  |  |
Preference shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
Parent |  |  |  |  |
ASSETS |  |  |  |  |
Short-term investments (available for sale) | $ 0 | $ 25,100 |  |  |
Trading Securities | 79,400 | 145,700 |  |  |
Cash and cash equivalents (including cash within consolidated variable interest entities of — $166.6 and $291.3) | 32,000 | 156,300 | $ 110,500 |  | $ 86,800
Investments in subsidiaries (1) | 3,394,700 | 3,405,800 |  |  |
Other investments (equity method) | 3,400 | 11,700 |  |  |
Eurobond issued by subsidiary | 0 | 480,000 |  |  |
Long-term debt issued by Silverton | 20,600 | 54,500 |  |  |
Intercompany funds due from affiliates | 5,200 | 9,800 |  |  |
Other assets | 8,800 | 8,600 |  |  |
Total assets | 3,544,100 | 4,297,500 |  |  |
LIABILITIES |  |  |  |  |
Accrued expenses and other payables | 4,700 | 6,400 |  |  |
Intercompany funds due to affiliates | 61,400 | 93,500 |  |  |
Long-term debt | 549,500 | 549,300 |  |  |
Total liabilities | 615,600 | 649,200 |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
59,474,085 shares of par value 0.15144558¢ each (December 31, 2016 — 59,774,464) | 100 | 100 |  |  |
Additional paid in capital | 954,700 | 1,259,600 |  |  |
Retained earnings | 2,026,900 | 2,392,300 |  |  |
Non-controlling interest | 2,700 | 1,400 |  |  |
Gain/(loss) on derivatives | 9,700 | 22,500 |  |  |
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) on Derivatives, Effect Net of Tax | 2,100 | (500) |  |  |
Gains on foreign currency translation | (67,700) | (27,100) |  |  |
Total accumulated other comprehensive (loss)/income | (55,900) | (5,100) |  |  |
Total shareholders’ equity | 2,928,500 | 3,648,300 |  |  |
Total liabilities and shareholders’ equity | $ 3,544,100 | $ 4,297,500 |  |  |
Ordinary shares, issued | 597,474,085 | 59,774,464 |  |  |
Ordinary shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
Parent | 5.950% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 11,000,000 | 11,000,000 |  |  |
Preference shares, rate | 5.95% | 5.95% |  |  |
Preference shares, par value | $ 0.0015144558 | $ 0.0015144558 |  |  |
Parent | 7.401% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued |  | 5,327,500 |  |  |
Preference shares, rate |  | 7.401% |  |  |
Preference shares, par value |  | $ 0.0015144558 |  |  |
Parent | 7.250% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | 0 | $ 0 |  |  |
Preference shares, issued |  | 6,400,000 |  |  |
Preference shares, rate |  | 7.25% |  |  |
Preference shares, par value |  | $ 0.0015144558 |  |  |
Parent | 5.625% Preference Shares |  |  |  |  |
SHAREHOLDERS’ EQUITY |  |  |  |  |
Preference shares, value | $ 0 | $ 0 |  |  |
Preference shares, issued | 10,000,000 | 10,000,000 |  |  |
Preference shares, rate | 5.625% | 5.625% |  |  |
Preference shares, par value | $ 0.0015144558 | $ 0.15144558 |  |  |

X
- Definition Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) on Derivatives, Effect Net of Tax + References No definition available. + Details
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- Definition Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 45 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=64808268&loc=d3e32022-110900 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 830 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6450520&loc=d3e32583-110901 + Details
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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e681-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 + Details
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- Definition Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6676-107765 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3044-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.1) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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