Earnings Per Share - Schedule of Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator
Net income attributable to SUI common shareholders	$ 163.1	$ 162.6	$ 222.8	$ 237.3
Less: allocation to restricted stock awards	1.2	1.1	1.6	1.5
Basic earnings - net income attributable to common shareholders after allocation to restricted stock awards	161.9	161.5	221.2	235.8
Diluted earnings - net income attributable to common shareholders after allocation to common and preferred OP units(1)	$ 161.9	$ 162.0	$ 221.2	$ 240.7
Denominator
Weighted average common shares outstanding (in shares)	123.5	122.4	123.4	119.2
Add: common shares dilutive effect: Forward Equity Offering (in shares)	0.0	0.0	0.0	0.2
Add: dilutive restricted stock (in shares)	0.0	0.0	0.0	0.0
Add: common and preferred OP units dilutive effect (in shares)	0.0	0.4	0.0	2.5
Diluted weighted average common shares and securities (in shares)	123.5	122.8	123.4	121.9
Basic earning per share (in dollars per share)	$ 1.31	$ 1.32	$ 1.79	$ 1.98
Diluted earning per share (in dollars per share)	$ 1.31	$ 1.32	$ 1.79	$ 1.97
Restricted Stock
Numerator
Add: allocation to restricted stock awards	$ 0.0	$ 0.0	$ 0.0	$ 0.0
Common and Preferred OP Units
Numerator
Add: allocation to restricted stock awards	$ 0.0	$ 0.5	$ 0.0	$ 4.9