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Segmented Information - Schedule of Non-Current Assets and Gross Revenue by Geographical Areas (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of geographical areas [line items] |  |
Non-current assets | $ 2,542.9 | $ 2,716.4
Gross revenue | 4,730.1 | 4,827.3
Canada |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 646.0 | 760.5
Gross revenue | 1,238.5 | 1,283.1
United States |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 1,430.0 | 1,486.2
Gross revenue | 2,655.2 | 2,688.1
United Kingdom |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 142.4 | 143.3
Gross revenue | 321.5 | 279.1
Other global geographies |  |
Disclosure of geographical areas [line items] |  |
Non-current assets | 324.5 | 326.4
Gross revenue | $ 514.9 | $ 577.0

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- Definition The amount of non-current assets other than financial instruments, deferred tax assets, post-employment benefit assets and rights arising under insurance contracts. [Refer: Deferred tax assets; Financial instruments, class [member]; Non-current assets; Types of insurance contracts [member]] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2020-01-01 -Paragraph 33 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2020-en-r&anchor=para_33_b&doctype=Standard -URIDate 2020-01-01 + Details
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