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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Schedule of Effective Income Tax Rate Reconciliation (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended
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Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
U.S. federal statutory rate | 21.00% | 35.00% | 21.00% | 35.00% | 35.00%
Difference between foreign statutory rate and U.S. statutory rate | 1.00% | (1.60%) | 1.20% | (1.70%) |
Excess tax benefits recognized on share-based compensation | (0.60%) | (1.00%) | (1.20%) | (2.50%) |
Tax on global intangible low-taxed income under the provisions of the Tax Reform Act | 0.90% |  | 1.00% |  |
Updates to the provisional amount recognized for the one-time mandatory deemed repatriation of Canadian earnings required by the Tax Reform Act |  |  | (0.90%) |  |
Other | 1.50% | 2.10% | 1.40% | 1.90% |
Effective tax rate | 23.80% | 34.50% | 22.50% | 32.70% |

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