EBP, Eligibility Age

No definition available.

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- Definition

EBP, Employer Contribution, Participant Compensation Matched

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

EBP, Forfeited Nonvested Account, Decrease from Employer Contribution and Administrative Expense

+ References

No definition available.

+ Details

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- Definition

EBP, Maximum Sick Pay Hours to Convert to Sick Leave Pay Deposit to Plan

+ References

No definition available.

+ Details

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- Definition

EBP, Note Receivable From Participant, Maximum Borrowing Term

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Contribution, After Tax, Maximum Annual Contribution to Eligible Compensation, Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

EBP, Participant Contribution, After Tax, Minimum Annual Contribution to Eligible Compensation, Percentage

+ References

No definition available.

+ Details

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- Definition

EBP, Participant Loan, Basis Spread On Variable Rate

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

EBP, Participant Withdrawal, Maximum Period for Payment

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	duration

- Definition

EBP, Requisite Service Period

+ References

No definition available.

+ Details

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- Definition

EBP, Sick Pay Hours To Convert to Plan Contributions

+ References

No definition available.

+ Details

Name:	cp_EBPSickPayHoursToConvertToPlanContributions
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Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of net asset available for benefit transferred to (from) employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) from (to) external plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 962
-SubTopic 325
-Name Accounting Standards Codification
-Section 55
-Paragraph 17
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478873/962-325-55-17

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule III))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 45
-Paragraph 8
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477063/962-205-45-8

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

+ Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage of employer matching contribution on eligible participant contribution to employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Namespace Prefix:	us-gaap-ebp_
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Balance Type:	na
Period Type:	duration

- Definition

Percentage of participant compensation eligible for employer matching contribution for participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Period Type:	duration

- Definition

Amount of plan asset, in forfeited nonvested account, no longer allocated to participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of maximum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow to total participant account balance.

+ References

+ Details

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- Definition

Amount of minimum account balance that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)) can borrow.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Percentage of eligible compensation contributed for participant automatically enrolled in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

+ Details

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Period Type:	duration

- Definition

Percentage of maximum pretax annual compensation that participant in employee stock purchase, saving, or similar plan (employee benefit plan (EBP)), is permitted to contribute to total pretax annual compensation.

+ References

+ Details

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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Interest rate on participant loan in schedule of asset held for investment of employee stock purchase, saving, or similar plan (employee benefit plan (EBP)).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name Employee Retirement Income Security Act of 1974
-Number 2520
-Section 103
-Subsection 10
-Paragraph b
-Subparagraph (1)(i)(D)
-Publisher DOL-EBSA

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6A-05(a)(Schedule I))
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147477804/962-205-S99-1

+ Details

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- Details

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- Details

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- Details

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- Details

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- Details

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SUMMARY DESCRIPTION OF THE PLAN - Narrative (Details) - EBP 002			12 Months Ended
	May 27, 2025 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2025 USD ($) year	Dec. 31, 2024 USD ($)
EBP, Description of Plan [Line Items]
Plan assets transferred to (from) the plan	$ 188,172,557	$ 22,011,512	$ 188,172,557	$ 22,011,512
Eligibility age \| year			18
Requisite service period			30 days
Minimum allowed participant contribution percentage			1.00%
Maximum allowed participant contribution percentage			75.00%
Automatic deferral percentage			3.00%
Sick pay hours to convert to plan contributions			80 hours
Sick pay hours to convert to sick leave pay deposit to plan			80 hours
Maximum allowable elective contribution percentage			75.00%
Forfeited account balances		$ 226,879	$ 44,931	226,879
Forfeited account balances reduced employer contributions and administrative expenses			293,652	$ 65,251
Notes receivable from participants, minimum borrowing			1,000
Notes receivable from participants, maximum borrowing			$ 50,000
Notes receivable from participants, maximum percentage of borrowing to vested account balance			50.00%
Notes receivable from participants, maximum borrowing term			5 years
Notes receivable from participants, interest rate spread over prime lending rate			2.00%
Participant withdrawal, maximum period for payment			10 years
Non-Union
EBP, Description of Plan [Line Items]
Employer matching contribution percentage			50.00%
Employer matching contribution, percentage of compensation			6.00%
CMQ U.S. Non-Union and Union
EBP, Description of Plan [Line Items]
Employer matching contribution, percentage of compensation			2.00%
Kansas City Southern Railway Company and SouthRail Corporation
EBP, Description of Plan [Line Items]
Employer matching contribution percentage			100.00%
Participant compensation matched by employer			$ 500
Employees Eligible for Employer Nonelective Contributions
EBP, Description of Plan [Line Items]
Employer matching contribution, percentage of compensation			3.50%
Minimum
EBP, Description of Plan [Line Items]
Notes receivable from participants, interest rate			5.25%
Maximum
EBP, Description of Plan [Line Items]
Notes receivable from participants, interest rate			10.50%