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Right-Of-Use Assets (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2021
USD ($)
site
Dec. 31, 2020
USD ($)
Right Of Use Asset Roll Forward [Roll Forward]    
Beginning balance $ 101.0 $ 104.1
Additions 42.6 27.9
Additions through business combination (note 3) 5.1  
Depreciation (32.0) (30.3)
Write-down of assets and lease terminations (0.3) (1.1)
Foreign exchange and other (2.6) 0.4
Ending balance 113.8 101.0
Reduction for tenant improvement allowances $ 0.4 4.2
Number of sites | site 1  
Land    
Right Of Use Asset Roll Forward [Roll Forward]    
Beginning balance $ 7.1 7.0
Additions 0.1 0.7
Additions through business combination (note 3) 4.3  
Depreciation (0.5) (0.6)
Write-down of assets and lease terminations 0.0 0.0
Foreign exchange and other (0.3) 0.0
Ending balance 10.7 7.1
Buildings    
Right Of Use Asset Roll Forward [Roll Forward]    
Beginning balance 91.7 94.7
Additions 42.1 26.9
Additions through business combination (note 3) 0.8  
Depreciation (31.0) (29.2)
Write-down of assets and lease terminations (0.3) (1.1)
Foreign exchange and other (2.3) 0.4
Ending balance 101.0 91.7
Other    
Right Of Use Asset Roll Forward [Roll Forward]    
Beginning balance 2.2 2.4
Additions 0.4 0.3
Additions through business combination (note 3) 0.0  
Depreciation (0.5) (0.5)
Write-down of assets and lease terminations 0.0 0.0
Foreign exchange and other 0.0 0.0
Ending balance $ 2.1 $ 2.2