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Other Assets - Schedule of Other Assets (Detail) - CAD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Disclosure of other assets [line items] |  |
Other financial assets | $ 144.2 | $ 147.1
Other Assets | 198.7 | 209.5
Less current portion - financial | 18.1 | 14.0
Less current portion - non-financial | 5.1 |
Long-term portion | 175.5 | 195.5
Other assets [member] | Investment tax credits [member] |  |
Disclosure of other assets [line items] |  |
Other non-financial assets | 6.1 | 9.2
Other assets [member] | Transaction costs on long term debt [member] |  |
Disclosure of other assets [line items] |  |
Other non-financial assets | 3.6 | 4.9
Other assets [member] | Deferred contract costs [member] |  |
Disclosure of other assets [line items] |  |
Other non-financial assets | 8.8 |
Other assets [member] | Investments held for self-insured liabilities [member] |  |
Disclosure of other assets [line items] |  |
Other financial assets | 144.2 | 147.1
Other assets [member] | Holdbacks on long-term contracts [member] |  |
Disclosure of other assets [line items] |  |
Other financial assets | 28.7 | 39.6
Other assets [member] | Indemnifications [member] |  |
Disclosure of other assets [line items] |  |
Other financial assets | 0.8 | 2.4
Other assets [member] | Other [member] |  |
Disclosure of other assets [line items] |  |
Other financial assets | $ 6.5 | $ 6.3

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