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Retirement Plans - Plan Assets and Estimated Future Benefit Payments (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Retirement plans |  |  |
Expected contribution in next fiscal year | $ 0.3 |  |
Estimated future benefit payments |  |  |
Fiscal 2018 | 1.0 |  |
Fiscal 2019 | 1.0 |  |
Fiscal 2020 | 1.1 |  |
Fiscal 2021 | 1.1 |  |
Fiscal 2022 | 1.2 |  |
Fiscal 2023 ‑ Fiscal 2027 | $ 7.0 |  |
Target and actual asset allocations |  |  |
Total target plan assets | 100.00% |  |
Total actual plan assets | 100.00% |  |
Total assets | $ 25.3 | $ 21.7 | $ 13.9
United States Retirement Plan |  |  |
Target and actual asset allocations |  |  |
Expected long-term return assumption (percentage) | 7.00% |  |
Canadian Retirement Plan |  |  |
Target and actual asset allocations |  |  |
Expected long-term return assumption (percentage) | 5.50% |  |
Equity securities |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 60.00% |  |
Total actual plan assets | 76.47% |  |
Debt securities |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 40.00% |  |
Total actual plan assets | 23.28% |  |
Other |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 0.00% |  |
Total actual plan assets | 0.25% |  |
U.S. equity |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 15.1 | 12.5 |
International equity |  |  |
Target and actual asset allocations |  |  |
Total assets | 4.2 | 3.7 |
Total equity based funds |  |  |
Target and actual asset allocations |  |  |
Total assets | 19.3 | 16.2 |
Common/collective trust - fixed income |  |  |
Target and actual asset allocations |  |  |
Total assets | 5.9 | 4.9 |
Money market funds |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 0.1 | $ 0.6 |

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