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Retirement Plans - Plan Assets and Estimated Future Benefit Payments (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Retirement plans |  |  |
Expected contribution in next fiscal year | $ 3.2 |  |
Estimated future benefit payments |  |  |
Fiscal 2016 | 0.9 |  |
Fiscal 2017 | 0.9 |  |
Fiscal 2018 | 1.0 |  |
Fiscal 2019 | 1.0 |  |
Fiscal 2020 | 1.1 |  |
Fiscal 2021 ‑ Fiscal 2024 | $ 6.5 |  |
Target and actual asset allocations |  |  |
Total target plan assets | 100.00% |  |
Total actual plan assets | 100.00% |  |
Total assets | $ 13.9 | $ 32.5 | $ 30.5
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% |  |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 0.0 | 0.0 |
Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 13.9 | 32.5 |
Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 0.0 | 0.0 |
Equity securities |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 60.00% |  |
Total actual plan assets | 74.83% |  |
Debt securities |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 40.00% |  |
Total actual plan assets | 21.03% |  |
Other |  |  |
Target and actual asset allocations |  |  |
Total target plan assets | 0.00% |  |
Total actual plan assets | 4.14% |  |
U.S. equity |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 7.7 | 19.6 |
U.S. equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
U.S. equity | Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 7.7 | 19.6 |
U.S. equity | Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
International equity |  |  |
Target and actual asset allocations |  |  |
Total assets | 2.7 | 5.2 |
International equity | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
International equity | Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 2.7 | 5.2 |
International equity | Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Total equity based funds |  |  |
Target and actual asset allocations |  |  |
Total assets | 10.4 | 24.8 |
Total equity based funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Total equity based funds | Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 10.4 | 24.8 |
Total equity based funds | Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Common/collective trust - fixed income |  |  |
Target and actual asset allocations |  |  |
Total assets | 2.9 | 7.0 |
Common/collective trust - fixed income | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Common/collective trust - fixed income | Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 2.9 | 7.0 |
Common/collective trust - fixed income | Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Money market funds |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.6 | 0.7 |
Money market funds | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.0 | 0.0 |
Money market funds | Significant Other Observable Inputs (Level 2) |  |  |
Target and actual asset allocations |  |  |
Total assets | 0.6 | 0.7 |
Money market funds | Significant Unobservable Inputs (Level 3) |  |  |
Target and actual asset allocations |  |  |
Total assets | $ 0.0 | $ 0.0 |

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