Cover Page - shares	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	Jul. 20, 2021
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2021
Entity Current Reporting Status		Yes
Entity Incorporation, State or Country Code	MD
Title of 12(b) Security		Common Stock, $0.01 par value
Document Transition Report	false
Entity File Number	1-12616
Trading Symbol		SUI
Entity Registrant Name	SUN COMMUNITIES INC
Entity Filer Category		Large Accelerated Filer
Entity Common Stock, Shares Outstanding			115,903,246
Entity Emerging Growth Company		false
Entity Small Business		false
Security Exchange Name		NYSE
Entity Tax Identification Number	38-2730780
Entity Address, Address Line One		27777 Franklin Rd,
Entity Address, Address Line Two		Suite 200,
Entity Address, City or Town		Southfield,
Entity Address, State or Province		MI
Entity Address, Postal Zip Code		48034
Entity Interactive Data Current		Yes
Entity Shell Company		false
City Area Code		248
Local Phone Number		208-2500
Entity Central Index Key		0000912593
Document Fiscal Year Focus		2021
Document Fiscal Period Focus		Q2
Current Fiscal Year End Date		--12-31
Amendment Flag		false