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Lease Assets - Amounts Recognized in the Consolidated Statement of Cash Flows (Details) - CAD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Leases [Abstract] |  |
Cash payments for the interest portion of lease liabilities | $ 28.8 | $ 32.3
Cash payments for leases not included in the measurement of lease liabilities | 47.4 | 53.6
Cash outflow in operating activities | 76.2 | 85.9
Cash payments for the principal portion of lease liabilities | 129.3 | 116.7
Proceeds from lease inducements | (2.8) | (50.4)
Cash outflow in financing activities | 126.5 | 66.3
Total cash outflow for leases | $ 202.7 | $ 152.2

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