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Committments and Contingent Liabilities (Details)
$ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2017
CAD ($)
Dec. 31, 2002
CAD ($)
Commitments and Contingencies Disclosure [Abstract]          
Indemnity       $ 5.0 $ 15.0
2019 $ 8.4        
2020 7.3        
2021 4.6        
2022 1.8        
2023 0.0        
After 2024 0.0        
Total 22.1        
Operating Leases, Rent Expense $ 15.1 $ 12.5 $ 11.0