Income Taxes	3 Months Ended
Apr. 01, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The effective tax rate differs from the Canadian statutory rate of 26.5% primarily due to changes in our valuation allowances, tax exempt income and mix of earnings in foreign jurisdictions which are subject to tax rates that differ from the Canadian statutory rate. In addition, we recognized $0.2 million of income tax benefit due to the exercise and delivery of share-based awards during the three months ended April 1, 2018, and $5.0 million during the three months ended April 2, 2017. In accordance with SAB 118, we have reflected the income tax effects of the aspects of the Tax Cuts and Jobs Act of 2017 ("Tax Reform") for which the accounting under ASC 740 is complete. Our provision for income taxes does include estimates around the timing of certain deductions. To the extent those estimates change, there could be effects to income tax expense due to the change in the tax rate. We would expect to be complete with this analysis upon filing of our tax return in 2018. Additionally, the final impact of Tax Reform may differ from our estimates due to additional regulations that may be issued or changes in interpretations as we gain a more thorough understanding of the tax law. These changes could be material to income tax expense.

Income Taxes

The effective tax rate differs from the Canadian statutory rate of 26.5% primarily due to changes in our valuation allowances, tax exempt income and mix of earnings in foreign jurisdictions which are subject to tax rates that differ from the Canadian statutory rate. In addition, we recognized $0.2 million of income tax benefit due to the exercise and delivery of share-based awards during the three months ended April 1, 2018, and $5.0 million during the three months ended April 2, 2017.

In accordance with SAB 118, we have reflected the income tax effects of the aspects of the Tax Cuts and Jobs Act of 2017 ("Tax Reform") for which the accounting under ASC 740 is complete. Our provision for income taxes does include estimates around the timing of certain deductions. To the extent those estimates change, there could be effects to income tax expense due to the change in the tax rate. We would expect to be complete with this analysis upon filing of our tax return in 2018. Additionally, the final impact of Tax Reform may differ from our estimates due to additional regulations that may be issued or changes in interpretations as we gain a more thorough understanding of the tax law. These changes could be material to income tax expense.