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Subsequent Event	9 Months Ended
Subsequent Event	Sep. 30, 2020
Subsequent Events [Abstract]
Subsequent Event	Subsequent event On October 15, 2020, CP and OMERS Infrastructure Management Inc. (“OMERS”) entered into a purchase agreement whereby CP will acquire the 83.5 percent ownership of the Detroit River Tunnel Partnership, currently held by certain affiliates of OMERS. CP currently owns the remaining 16.5 percent. The purchase price for the transaction is approximately U.S. $312 million subject to customary closing adjustments. The acquisition is currently expected to close at the end of 2020 and is subject to customary closing conditions, including regulatory approvals.