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Lease Assets - Summary of Right-of-use Assets (Details) - CAD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Disclosure of quantitative information about right-of-use assets [line items] |  |
Beginning balance | $ 558.5 |
Depreciation | (117.7) | $ (115.8)
Ending balance | 447.0 | 558.5
Lease assets |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Beginning balance | 558.5 | 561.8
Additions | 42.4 | 65.5
Acquisitions | 7.0 | 19.4
Depreciation | (117.7) | (115.8)
Modifications | 16.8 | 42.6
Impairment | (59.1) | (2.0)
Foreign exchange | (0.9) | (13.0)
Ending balance | 447.0 | 558.5
Buildings | Lease assets |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Beginning balance | 554.4 | 556.6
Additions | 40.7 | 63.9
Acquisitions | 7.0 | 19.3
Depreciation | (115.0) | (113.2)
Modifications | 16.4 | 42.6
Impairment | (59.1) | (2.0)
Foreign exchange | (1.0) | (12.8)
Ending balance | 443.4 | 554.4
Other | Lease assets |  |
Disclosure of quantitative information about right-of-use assets [line items] |  |
Beginning balance | 4.1 | 5.2
Additions | 1.7 | 1.6
Acquisitions | 0.0 | 0.1
Depreciation | (2.7) | (2.6)
Modifications | 0.4 | 0.0
Impairment | 0.0 | 0.0
Foreign exchange | 0.1 | (0.2)
Ending balance | $ 3.6 | $ 4.1

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph h -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_h&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of depreciation of right-of-use assets. [Refer: Depreciation and amortisation expense; Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_a&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2020-01-01 -Paragraph 53 -Subparagraph j -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2020-en-r&anchor=para_53_j&doctype=Standard -URIDate 2020-01-01 + Details
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- Definition Acquisitions through business combinations, right-of-use assets + References No definition available. + Details
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- Definition Impairment loss (reversal of impairment loss) recognised in profit or loss, right-of-use assets + References No definition available. + Details
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