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Lease Assets and Lease Liabilities - Summary of Lease Assets and Liabilities (Detail)
$ in Millions
 12 Months Ended
Dec. 31, 2019
CAD ($)
Disclosure Of Lease Assets And Liabilities [Abstract]  
Depreciation $ (115.8)
December 31, 2019 558.5
December 31, 2019 (688.9)
Less current portion 99.9
Long-term portion (589.0)
Lease liabilities [member]  
Disclosure Of Lease Assets And Liabilities [Abstract]  
January 1, 2019 (645.0)
Additions (64.0)
Acquisitions (19.1)
Modifications (42.7)
Accretion of interest (32.3)
Payments, net of receipts 98.6
Foreign exchange 15.6
December 31, 2019 (688.9)
Less current portion 99.9
Long-term portion (589.0)
Lease asset [member]  
Disclosure Of Lease Assets And Liabilities [Abstract]  
January 1, 2019 561.8
Additions 65.5
Acquisitions 19.4
Depreciation (115.8)
Modifications 42.6
Impairment (2.0)
Foreign exchange (13.0)
December 31, 2019 558.5
Long-term portion 558.5
Buildings [member] | Lease asset [member]  
Disclosure Of Lease Assets And Liabilities [Abstract]  
January 1, 2019 556.6
Additions 63.9
Acquisitions 19.3
Depreciation (113.2)
Modifications 42.6
Impairment (2.0)
Foreign exchange (12.8)
December 31, 2019 554.4
Long-term portion 554.4
Other [member] | Lease asset [member]  
Disclosure Of Lease Assets And Liabilities [Abstract]  
January 1, 2019 5.2
Additions 1.6
Acquisitions 0.1
Depreciation (2.6)
Foreign exchange (0.2)
December 31, 2019 4.1
Long-term portion $ 4.1