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Financial Instruments And Risk Management - Risk Management (Details) $ in Millions, $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 CAD ($) | Dec. 31, 2017 CAD ($) | Dec. 31, 2018 USD ($) $ / bbl | Dec. 31, 2018 CAD ($) $ / bbl | Dec. 31, 2016 CAD ($)
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Forward starting swaps |  | $ 1,052.0 |  | $ 1,384.0 |
Weighted average interest rate on total debt |  | 5.50% | 5.40% | 5.40% |
Cash and cash equivalents |  | $ 2,672.0 |  | $ 2,221.0 | $ 3,016.0
Total credit facilities |  |  |  | 8,398.0 |
Total unutilized credit facilities |  |  |  | $ 3,898.0 |
Commodity Price Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Increase in price per barrel of crude oil | $ / bbl |  |  | 10.00 | 10.00 |
Decrease in pre tax earnings for the company's outstanding derivative financial instruments | $ 39.0 | 196.0 |  |  |
Foreign Currency Exchange Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Strengthening in the Cdn$ relative to the US$ | 1.00% |  |  |  |
Gains (losses) on change in value of foreign currency basis spreads, net of tax | $ 167.0 | 142.0 |  |  |
Liquidity Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Cash and cash equivalents |  |  |  | $ 2,200.0 |
Total credit facilities |  |  |  | 8,400.0 |
Total unutilized credit facilities |  |  |  | 3,900.0 |
Unused capacity under a Canadian debt shelf prospectus |  |  |  | $ 3,000.0 |
Unused capacity under Canadian and U.S. universal shelf prospectus |  |  | $ 3,000 |  |
Variable interest rates | Interest Rate Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Increase in interest rates | 1.00% |  |  |  |
Increase (decrease) in pre-tax earnings from increase in interest rates | $ (10.0) | $ 6.0 |  |  |
Proportion of floating interest rate exposure | 18.60% | 14.90% |  |  |
Weighted average | Fixed interest rates | Interest Rate Risk |  |  |  |  |
Risk Management Strategy Related to Hedge Accounting |  |  |  |  |
Weighted average interest rate on total debt |  | 5.70% | 5.40% | 5.40% |

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