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Retirement Plans - Plan Assets and Estimated Future Benefit Payments (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Retirement plans      
Expected contribution in next fiscal year $ 1.4    
Estimated future benefit payments      
Fiscal 2019 1.0    
Fiscal 2020 1.0    
Fiscal 2021 1.1    
Fiscal 2022 1.2    
Fiscal 2023 1.2    
Fiscal 2024 ‑ Fiscal 2028 $ 7.4    
Target and actual asset allocations      
Total target plan assets 100.00%    
Total actual plan assets 100.00%    
Total assets $ 22.2 $ 25.3 $ 21.7
United States Retirement Plan      
Target and actual asset allocations      
Expected long-term return assumption (percentage) 6.50%    
Canadian Retirement Plan      
Target and actual asset allocations      
Expected long-term return assumption (percentage) 5.50%    
Total equity based funds      
Target and actual asset allocations      
Total target plan assets 60.00%    
Total actual plan assets 79.50%    
Total assets $ 17.7 19.3  
Debt securities      
Target and actual asset allocations      
Total target plan assets 40.00%    
Total actual plan assets 20.00%    
Other      
Target and actual asset allocations      
Total target plan assets 0.00%    
Total actual plan assets 0.50%    
U.S. equity      
Target and actual asset allocations      
Total assets $ 14.1 15.1  
International equity      
Target and actual asset allocations      
Total assets 3.6 4.2  
Common/collective trust - fixed income      
Target and actual asset allocations      
Total assets 4.4 5.9  
Money market funds      
Target and actual asset allocations      
Total assets $ 0.1 $ 0.1