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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