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Contingencies (Details)
$ in Millions, $ in Millions, $ in Millions
1 Months Ended 12 Months Ended
Oct. 31, 2019
CAD ($)
Oct. 31, 2019
USD ($)
Aug. 31, 2020
CAD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2018
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
Aug. 31, 2020
USD ($)
Dec. 31, 2019
MXN ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
USD ($)
Oct. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Contingencies                                    
Income taxes paid                 $ 51.2   $ 38.6              
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Canada                                    
Contingencies                                    
Provincial income taxes assessed $ 1.4 $ 1.1                                
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Mexico                                    
Contingencies                                    
Provincial income taxes assessed                   $ 14.5 $ 11.4              
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Barbados                                    
Contingencies                                    
Provincial income taxes assessed               $ 6.7 5.3                  
Percentage of security deposit for notice of objection against reassessment               50.00%       50.00%            
Canada Revenue Agency Reassessment Action | Reassessment for the 2013 and 2014 and 2015 taxation years | Mexico                                    
Contingencies                                    
Contingent liability recorded               $ 10.3       $ 8.1            
Provincial income taxes assessed               25.3 19.9                  
Percentage of security deposit for notice of objection against reassessment                           50.00% 50.00% 50.00%    
Canada Revenue Agency Reassessment Action | Tax Year 2016 Through 2020 | Canada                                    
Contingencies                                    
Provincial income taxes assessed 42.8 $ 33.6                                
Canada Revenue Agency Reassessment Action | Tax Year 2016 Through 2020 | Mexico                                    
Contingencies                                    
Provincial income taxes assessed               $ 4.6 3.6                  
Income taxes paid             $ 71.0   $ 3.8                  
Tax rate (as a percent)             30.00% 30.00% 30.00%                  
Canada Revenue Agency Reassessment Action | Tax Year 2016 Through 2020 | Barbados                                    
Contingencies                                    
Provincial income taxes assessed               $ 174.2 $ 136.8                  
Canada Revenue Agency Reassessment Action | Tax Year 2013 Through 2015                                    
Contingencies                                    
Contingent liability recorded                           $ 419.4   $ 30.3    
Tax rate (as a percent)                   30.00% 30.00%              
Canada Revenue Agency Reassessment Action | 2013 taxation year | Mexico                                    
Contingencies                                    
Provincial income taxes assessed         $ 10.8 $ 8.5                        
Canada Revenue Agency Reassessment Action | Reassessment for the 2012 and 2013 | Barbados                                    
Contingencies                                    
Provincial income taxes assessed     $ 7.7 $ 6.0                            
Percentage of security deposit for notice of objection against reassessment     50.00%                   50.00%          
Canada Revenue Agency Transfer Pricing Contingent Penalty | Reassessment for the 2014 and 2015 taxation years | Barbados                                    
Contingencies                                    
Contingent liability recorded               2.5       2.0            
Canada Revenue Agency Transfer Pricing Contingent Penalty | Reassessment for the 2013 and 2014 and 2015 taxation years | Mexico                                    
Contingencies                                    
Contingent liability recorded               10.3       8.1            
Canada Revenue Agency Transfer Pricing Contingent Penalty | Tax Year 2016 Through 2020 | Mexico                                    
Contingencies                                    
Contingent liability recorded               1.7       1.4            
Canada Revenue Agency Transfer Pricing Contingent Penalty | Tax Year 2016 Through 2020 | Barbados                                    
Contingencies                                    
Contingent liability recorded               65.6       51.5            
Canada Revenue Agency interest and other penalties | Reassessment for the 2014 and 2015 taxation years | Canada                                    
Contingencies                                    
Contingent liability recorded 0.2                               $ 0.2  
Canada Revenue Agency interest and other penalties | Reassessment for the 2014 and 2015 taxation years | Mexico                                    
Contingencies                                    
Contingent liability recorded                             $ 5.0 $ 3.9    
Canada Revenue Agency interest and other penalties | Reassessment for the 2014 and 2015 taxation years | Barbados                                    
Contingencies                                    
Contingent liability recorded               2.2       1.7            
Canada Revenue Agency interest and other penalties | Reassessment for the 2013 and 2014 and 2015 taxation years | Mexico                                    
Contingencies                                    
Contingent liability recorded               9.2       7.1            
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Canada                                    
Contingencies                                    
Contingent liability recorded $ 5.3                               $ 4.1  
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Mexico                                    
Contingencies                                    
Contingent liability recorded               1.1       0.9            
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Barbados                                    
Contingencies                                    
Contingent liability recorded               $ 14.0       $ 11.0            
Canada Revenue Agency interest and other penalties | 2013 taxation year | Mexico                                    
Contingencies                                    
Contingent liability recorded         $ 4.2                         $ 3.2
Canada Revenue Agency interest and other penalties | Reassessment for the 2012 and 2013 | Barbados                                    
Contingencies                                    
Contingent liability recorded     $ 3.1                   $ 2.4