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Income Taxes, Schedule of Statutory Tax Rates (Details) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) |  | 29.80% | 27.10% | 32.80%
U.S. [Member] |  |  |  |
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) | [1] | 35.00% | 35.00% | 35.00%
Canada [Member] |  |  |  |
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) |  | 15.00% | 15.00% | 15.00%
U.K. [Member] |  |  |  |
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) |  | 19.00% | 20.25% | 20.25%
Ireland [Member] |  |  |  |
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) |  | 13.00% | 12.50% | 12.50%
Aruba [Member] |  |  |  |
Statutory Tax Rates |  |  |  |
Applicable statutory income tax rate (percent) | [2] |  | 7.00% | 7.00%
[1] | Statutory income tax rate was reduced to 21 percent effective January 1, 2018 as described in “Tax Reform” above.
[2] | Statutory income tax rate applicable through the date of the Aruba Disposition as described in Note 2.

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