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Other Charges (Recoveries) - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended 27 Months Ended
Dec. 31, 2019
Mar. 31, 2019
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2019
Restructuring and Related Costs [Line Items]                    
Expense of restructuring activities             $ 37.9 $ 35.4 $ 28.9  
Cash charges             28.1 35.2 25.1  
Impairment             9.8 0.2    
Impairment loss (reversal of impairment loss) recognised in profit or loss             9.8 0.2 3.8  
Restructuring provision $ 11.2       $ 11.2   11.2 10.3   $ 11.2
Losses on pension and non-pension post-employment benefit plans     $ 63.3     $ 1.9 4.1 0.0 1.9  
Toronto transition costs (recoveries)             (95.8) 13.2 1.6  
Accelerated amortization of unamortized deferred financing costs             2.0 1.2 0.0  
Integration and acquisition-related transaction costs             3.9 $ 11.0 4.5  
Gains on litigation settlements                 $ 1.1  
Cost Efficiency Initiative                    
Restructuring and Related Costs [Line Items]                    
Expense of restructuring activities       $ 8.0           $ 81.3
Pension Plan Adjustment From Change In Law                    
Restructuring and Related Costs [Line Items]                    
Expense of restructuring activities 4.1                  
Gain on Sale of Toronto Property                    
Restructuring and Related Costs [Line Items]                    
Toronto transition costs (recoveries)   $ (102.0)                
Internal Transition Costs                    
Restructuring and Related Costs [Line Items]                    
Toronto transition costs (recoveries)         $ 2.4          
Prior credit facility                    
Restructuring and Related Costs [Line Items]                    
Accelerated amortization of unamortized deferred financing costs     $ 1.2              
Fee and commission expense $ 2.0           2.0      
Right-of-use assets                    
Restructuring and Related Costs [Line Items]                    
Write-downs of property, plant and equipment             $ 1.0