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Segmented Information - Schedule of Non-Current Assets and Gross Revenue by Geographical Areas (Detail) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Disclosure of geographical areas [line items] |  |
Non-current assets | $ 2,158.3 | $ 2,031.6
Gross revenue | 4,283.8 | 4,028.7
Canada [member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 535.2 | 452.4
Gross revenue | 1,275.8 | 1,191.7
United States [member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,342.3 | 1,311.2
Gross revenue | 2,334.6 | 2,226.0
United Kingdom [member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 140.5 | 119.3
Gross revenue | 184.9 | 129.4
Other Countries [member] |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 140.3 | 148.7
Gross revenue | $ 488.5 | $ 481.6

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