Commitments - Future Minimum Rental Payments Payable under Noncancellable Operating Leases and Purchase Obligations (Detail) CAD in Millions	Dec. 31, 2017 CAD
Disclosure of maturity analysis of operating lease payments [line items]
Future Minimum Rental Payments Payable	CAD 1,135.1
Within one year [member]
Disclosure of maturity analysis of operating lease payments [line items]
Future Minimum Rental Payments Payable	214.4
2018 to 2022 [member]
Disclosure of maturity analysis of operating lease payments [line items]
Future Minimum Rental Payments Payable	571.5
More than five years [member]
Disclosure of maturity analysis of operating lease payments [line items]
Future Minimum Rental Payments Payable	CAD 349.2

The amount of future minimum lease payments payable under non-cancellable operating leases. Minimum lease payments are payments over the lease term that the lessee is or can be required to make, excluding contingent rent, costs for services and taxes to be paid by, and reimbursed to, the lessor, together with: (a) for a lessee, any amounts guaranteed by the lessee or by a party related to the lessee; or (b) for a lessor, any residual value guaranteed to the lessor by: (i) the lessee; (ii) a party related to the lessee; or (iii) a third party unrelated to the lessor that is financially capable of discharging the obligations under the guarantee.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Expiry date 2019-01-01
-Name IAS
-Number 17
-IssueDate 2017-01-01
-Paragraph 35
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=17&date=2017-03-02&anchor=para_35_a&doctype=Standard&book=B
-URIDate 2017-03-09

Name:	ifrs-full_MinimumLeasePaymentsPayableUnderNoncancellableOperatingLease
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant