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Contingencies (Details)
$ in Millions, $ in Millions, $ in Millions
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 09, 2021
USD ($)
Aug. 09, 2021
CAD ($)
Aug. 31, 2020
USD ($)
Aug. 31, 2020
CAD ($)
Oct. 31, 2019
USD ($)
Oct. 31, 2019
CAD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2021
CAD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
CAD ($)
Dec. 31, 2020
MXN ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2018
CAD ($)
Jun. 30, 2021
CAD ($)
Dec. 31, 2020
CAD ($)
Aug. 31, 2020
CAD ($)
Dec. 31, 2019
CAD ($)
Dec. 31, 2019
MXN ($)
Oct. 31, 2019
CAD ($)
Dec. 31, 2018
CAD ($)
Contingencies                                              
Income taxes paid             $ 51.3   $ 33.5                            
Tax Year 2016 Through 2020 | Canada                                              
Contingencies                                              
Contingent liability recorded                                           $ 5.2  
Tax Year 2016 Through 2020 | Barbados                                              
Contingencies                                              
Provincial income taxes assessed             $ 140.6                                
Canada Revenue Agency Reassessment Action | Canada                                              
Contingencies                                              
Proposed increase in taxonable income $ 31.9                                            
Provincial income taxes assessed $ 8.1 $ 10.0                                          
Canada Revenue Agency Reassessment Action | Mexico                                              
Contingencies                                              
Percentage of security deposit for notice of objection against reassessment             50.00%                   50.00%            
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Canada                                              
Contingencies                                              
Provincial income taxes assessed         $ 1.1 $ 1.4                                  
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Mexico                                              
Contingencies                                              
Provincial income taxes assessed                         $ 11.7 $ 14.5                  
Canada Revenue Agency Reassessment Action | Reassessment for the 2014 and 2015 taxation years | Barbados                                              
Contingencies                                              
Provincial income taxes assessed             $ 5.4 $ 6.7                              
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             8.3                   $ 10.3            
Provincial income taxes assessed             20.4 25.3                              
Canada Revenue Agency Reassessment Action | Tax Year 2016 Through 2020 | Canada                                              
Contingencies                                              
Provincial income taxes assessed         34.6 $ 42.8                                  
Canada Revenue Agency Reassessment Action | Tax Year 2016 Through 2020 | Mexico                                              
Contingencies                                              
Provincial income taxes assessed             3.7 4.6   $ 3.7 $ 4.6                        
Income taxes paid                   $ 3.8   $ 71.0                      
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             140.6 174.2                              
Canada Revenue Agency Reassessment Action | Tax Year 2016 | Canada                                              
Contingencies                                              
Provincial income taxes assessed             8.1 10.0                              
Canada Revenue Agency Reassessment Action | Tax Year 2017 Through 2020 | Canada                                              
Contingencies                                              
Provincial income taxes assessed             26.5 32.8                              
Canada Revenue Agency Reassessment Action | Tax Year 2013 Through 2015                                              
Contingencies                                              
Contingent liability recorded                         $ 30.3               $ 419.4    
Tax rate (as a percent)                         30.00% 30.00%                  
Canada Revenue Agency Reassessment Action | 2013 taxation year | Mexico                                              
Contingencies                                              
Provincial income taxes assessed                             $ 8.7 $ 10.8              
Canada Revenue Agency Reassessment Action | Reassessment for the 2012 and 2013                                              
Contingencies                                              
Percentage of security deposit for notice of objection against reassessment     50.00%                               50.00%        
Canada Revenue Agency Reassessment Action | Reassessment for the 2012 and 2013 | Barbados                                              
Contingencies                                              
Provincial income taxes assessed     $ 6.2 $ 7.7     6.2 $ 7.7                              
Canada Revenue Agency Transfer Pricing Contingent Penalty | Reassessment for the 2014 and 2015 taxation years | Barbados                                              
Contingencies                                              
Contingent liability recorded             2.0                   2.5            
Canada Revenue Agency Transfer Pricing Contingent Penalty | Reassessment for the 2013 and 2014 and 2015 taxation years | Mexico                                              
Contingencies                                              
Contingent liability recorded                   $ 8.3               $ 10.3          
Canada Revenue Agency Transfer Pricing Contingent Penalty | Tax Year 2016 Through 2020 | Mexico                                              
Contingencies                                              
Contingent liability recorded             1.4     1.4             1.7 1.7          
Canada Revenue Agency Transfer Pricing Contingent Penalty | Tax Year 2016 Through 2020 | Barbados                                              
Contingencies                                              
Contingent liability recorded             52.9                   65.6            
Canada Revenue Agency Transfer Pricing Contingent Penalty | Reassessment for the 2012 and 2013 | Barbados                                              
Contingencies                                              
Contingent liability recorded     $ 2.7                                        
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 | Barbados                                              
Contingencies                                              
Contingent liability recorded             2.0                   2.5            
Canada Revenue Agency interest and other penalties | Reassessment for the 2013 and 2014 and 2015 taxation years | Mexico                                              
Contingencies                                              
Contingent liability recorded             8.2                   10.3            
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Canada                                              
Contingencies                                              
Contingent liability recorded         $ 5.2                                 $ 6.4  
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Mexico                                              
Contingencies                                              
Contingent liability recorded             1.0     $ 1.0             1.2 $ 1.2          
Canada Revenue Agency interest and other penalties | Tax Year 2016 Through 2020 | Barbados                                              
Contingencies                                              
Contingent liability recorded             14.6                   18.1            
Canada Revenue Agency interest and other penalties | 2013 taxation year | Mexico                                              
Contingencies                                              
Contingent liability recorded                         $ 4.5   $ 3.8         $ 5.6     $ 4.7
Canada Revenue Agency interest and other penalties | Reassessment for the 2012 and 2013 | Barbados                                              
Contingencies                                              
Contingent liability recorded             $ 2.7                   $ 3.4   $ 3.4