Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2021	Apr. 15, 2022	Jun. 30, 2021
Document Information [Line Items]
Document Type	10-K
Document Period End Date	Dec. 31, 2021
Amendment Flag	false
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2021
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Registrant Name	COLONNADE ACQUISITION CORP. II
Entity Interactive Data Current	Yes
Current Fiscal Year End Date	--12-31
Entity Central Index Key	0001837739
Entity Address, State or Province	FL
Document Annual Report	true
Document Transition Report	false
Entity Shell Company	true
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity File Number	001-40184
Entity Incorporation, State or Country Code	E9
Entity Address, Address Line One	1400 Centrepark Blvd
Entity Address, Address Line Two	Ste 810
Entity Address, City or Town	West Palm Beach
Entity Address, Postal Zip Code	33401
Entity Tax Identification Number	00-0000000
Entity Public Float			$ 322,410,000
ICFR Auditor Attestation Flag	false
City Area Code	561
Local Phone Number	712-7860
Auditor Name	Marcum LLP
Auditor Firm ID	688
Auditor Location	Houston, Texas
Capital Units [Member]
Document Information [Line Items]
Title of 12(b) Security	Units, each consisting of one Class A ordinary share, $0.0001 par value, and one-fifth of one redeemable warrant
Trading Symbol	CLAA.U
Security Exchange Name	NYSE
Warrant [Member]
Document Information [Line Items]
Title of 12(b) Security	Redeemable warrants, each warrant exercisable for one Class A ordinary share at an exercise price of $11.50 per share
Trading Symbol	CLAA WS
Security Exchange Name	NYSE
Common Class A [Member]
Document Information [Line Items]
Title of 12(b) Security	Class A ordinary shares, par value $0.0001 per share
Trading Symbol	CLAA
Security Exchange Name	NYSE
Entity Common Stock, Shares Outstanding		33,000,000
Common Class B [Member]
Document Information [Line Items]
Entity Common Stock, Shares Outstanding		8,250,000