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Credit Facility and Long-term Debt (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Disclosure [Abstract] |
Summary of Contractual Obligations Under Long-term Debts | The following table summarizes our contractual obligations under the long-term debts as at December 31, 2018.
|  |  | Payments Due By Period
Contractual Basis |  |  | Less than 1 year |  | 1-3 years |  | 3-5 years |  | More than 5 years |  | Total
|  |  | ($ in millions)
Long-term Debt Obligations |  | $ | — |  |  | $ | 125.0 |  |  | $ | 300.0 |  |  | $ | — |  |  | $ | 425.0 |

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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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