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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract] |
Schedule of Company's Restricted Assets | The following table details the forms and value of Company’s restricted assets as at December 31, 2017 and 2016:
|  | As at December 31, 2017 |  | At December 31, 2016
|  | ($ in millions, except percentages)
Regulatory trusts and deposits: |  |  |  |
Affiliated transactions |  | $ | 1,455.0 |  |  | $ | 1,482.8 |
Third party |  | 2,425.3 |  |  | 2,380.8 |
Letters of credit / guarantees(1) |  | 658.5 |  |  | 672.1 |
Investment commitment — real estate fund |  | 100.0 |  |  | — |
Total restricted assets |  | $ | 4,638.8 |  |  | $ | 4,535.7 |
Total as percent of investable assets (2) |  | 53.4 | % |  | 49.3 | %
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(1) | As at December 31, 2017, the Company had pledged funds of $658.5 million and £0.0 million (December 31, 2016 — $672.0 million and £7.2 million) as collateral for the secured letters of credit.
(2) | Investable assets comprise total investments, cash and cash equivalents, accrued interest, receivables for securities sold and payables for securities purchased.
Amounts Outstanding under Operating Leases | Amounts outstanding under operating leases net of subleases as at December 31, 2017 and 2016 were:
As at December 31, 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Later Years |  | Total
|  | ($ in millions)
Operating Lease Obligations |  | $ | 16.2 |  |  | $ | 16.1 |  |  | $ | 15.3 |  |  | $ | 11.0 |  |  | $ | 8.7 |  |  | $ | 78.7 |  |  | $ | 146.0 |
As at December 31, 2016 |  | 2017 |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | Later Years |  | Total
|  | ($ in millions)
Operating Lease Obligations |  | $ | 16.1 |  |  | $ | 15.3 |  |  | $ | 14.0 |  |  | $ | 9.9 |  |  | $ | 8.7 |  |  | $ | 86.4 |  |  | $ | 150.4 |

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + Details
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- Definition Tabular disclosure of the fair value of assets, by major investment asset category, supporting separate accounts with additional insurance benefits and minimum investment return guarantees as of each date for which a statement of financial position is presented. The taxonomy for investment disclosures is utilized to tag elements that represent more detailed breakdowns of the major investment categories specified in reporting regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (b)(2) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 20 -Section 55 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6588021&loc=d3e7104-158389 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 80 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=6484115&loc=d3e19393-158473 + Details
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