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Intangible Assets - Summary of Intangible Assets (Detail) - CAD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance $ 247.7  
Ending Balance 219.6 $ 247.7
Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 247.7  
Ending Balance   247.7
Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (5.7)  
Ending Balance   (5.7)
Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 242.0  
Ending Balance   242.0
Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   430.5
Additions 12.0 33.2
Additions arising on acquisitions 41.4 33.0
Discontinued operations (note 8)   (29.4)
Removal of fully amortized assets (29.4) (79.7)
Impact of foreign exchange (13.5) 18.4
Ending Balance 406.3  
Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 406.0  
Ending Balance   406.0
Gross carrying amount [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (10.2)  
Ending Balance   (10.2)
Gross carrying amount [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 395.8  
Ending Balance   395.8
Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   (168.1)
Amortization - continuing operations (66.9) (65.0)
Amortization - discontinued operations   (5.7)
Discontinued operations (note 8)   9.2
Removal of fully amortized assets 29.4 79.7
Impact of foreign exchange 4.6 (8.4)
Ending Balance (186.7)  
Accumulated depreciation and amortization [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (158.3)  
Ending Balance   (158.3)
Accumulated depreciation and amortization [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 4.5  
Ending Balance   4.5
Accumulated depreciation and amortization [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (153.8)  
Ending Balance   (153.8)
Client relationships [member]    
Disclosure of detailed information about intangible assets [line Items]    
Ending Balance 182.4  
Client relationships [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 191.1  
Ending Balance   191.1
Client relationships [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 191.1  
Ending Balance   191.1
Client relationships [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   289.5
Additions arising on acquisitions 29.5 25.1
Discontinued operations (note 8)   (19.7)
Removal of fully amortized assets   (3.9)
Impact of foreign exchange (11.5) 16.3
Ending Balance 325.3  
Client relationships [member] | Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 307.3  
Ending Balance   307.3
Client relationships [member] | Gross carrying amount [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 307.3  
Ending Balance   307.3
Client relationships [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   (90.4)
Amortization - continuing operations (31.1) (26.9)
Amortization - discontinued operations   (1.8)
Discontinued operations (note 8)   4.9
Removal of fully amortized assets   3.9
Impact of foreign exchange 4.4 (5.9)
Ending Balance (142.9)  
Client relationships [member] | Accumulated depreciation and amortization [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (116.2)  
Ending Balance   (116.2)
Client relationships [member] | Accumulated depreciation and amortization [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (116.2)  
Ending Balance   (116.2)
Contract backlog [member]    
Disclosure of detailed information about intangible assets [line Items]    
Ending Balance 4.9  
Contract backlog [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 4.9  
Ending Balance   4.9
Contract backlog [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 4.9  
Ending Balance   4.9
Contract backlog [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   47.9
Additions arising on acquisitions 10.3 5.7
Removal of fully amortized assets (4.7) (46.2)
Impact of foreign exchange (0.4) 1.1
Ending Balance 13.7  
Contract backlog [member] | Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 8.5  
Ending Balance   8.5
Contract backlog [member] | Gross carrying amount [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 8.5  
Ending Balance   8.5
Contract backlog [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   (37.6)
Amortization - continuing operations (10.0) (9.9)
Amortization - discontinued operations   (1.4)
Removal of fully amortized assets 4.7 46.2
Impact of foreign exchange 0.1 (0.9)
Ending Balance (8.8)  
Contract backlog [member] | Accumulated depreciation and amortization [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (3.6)  
Ending Balance   (3.6)
Contract backlog [member] | Accumulated depreciation and amortization [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (3.6)  
Ending Balance   (3.6)
Software [member]    
Disclosure of detailed information about intangible assets [line Items]    
Ending Balance 30.5  
Software [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 42.5  
Ending Balance   42.5
Software [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 42.5  
Ending Balance   42.5
Software [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   65.6
Additions 12.0 33.2
Additions arising on acquisitions 1.3 0.2
Discontinued operations (note 8)   (5.3)
Removal of fully amortized assets (23.7) (18.8)
Impact of foreign exchange 0.2 0.3
Ending Balance 65.0  
Software [member] | Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 75.2  
Ending Balance   75.2
Software [member] | Gross carrying amount [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 75.2  
Ending Balance   75.2
Software [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   (26.9)
Amortization - continuing operations (25.0) (25.7)
Amortization - discontinued operations   (0.7)
Discontinued operations (note 8)   1.9
Removal of fully amortized assets 23.7 18.8
Impact of foreign exchange (0.5) (0.1)
Ending Balance (34.5)  
Software [member] | Accumulated depreciation and amortization [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (32.7)  
Ending Balance   (32.7)
Software [member] | Accumulated depreciation and amortization [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (32.7)  
Ending Balance   (32.7)
Other [member]    
Disclosure of detailed information about intangible assets [line Items]    
Ending Balance 1.8  
Other [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 9.2  
Ending Balance   9.2
Other [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (5.7)  
Ending Balance   (5.7)
Other [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 3.5  
Ending Balance   3.5
Other [member] | Gross carrying amount [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   27.5
Additions arising on acquisitions 0.3 2.0
Discontinued operations (note 8)   (4.4)
Removal of fully amortized assets (1.0) (10.8)
Impact of foreign exchange (1.8) 0.7
Ending Balance 2.3  
Other [member] | Gross carrying amount [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 15.0  
Ending Balance   15.0
Other [member] | Gross carrying amount [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance 4.8  
Ending Balance   4.8
Other [member] | Accumulated depreciation and amortization [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance   (13.2)
Amortization - continuing operations (0.8) (2.5)
Amortization - discontinued operations   (1.8)
Discontinued operations (note 8)   2.4
Removal of fully amortized assets 1.0 10.8
Impact of foreign exchange 0.6 (1.5)
Ending Balance (0.5)  
Other [member] | Accumulated depreciation and amortization [member] | Previously stated [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (5.8)  
Ending Balance   (5.8)
Other [member] | Accumulated depreciation and amortization [member] | Balance After Adjustment [Member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (1.3)  
Ending Balance   (1.3)
Other [member] | Gross carrying amount [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance (10.2)  
Ending Balance   (10.2)
Other [member] | Accumulated depreciation and amortization [member] | Increase (decrease) due to changes in accounting policy required by IFRS [member]    
Disclosure of detailed information about intangible assets [line Items]    
Beginning Balance $ 4.5  
Ending Balance   $ 4.5