Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 175,817	$ 39,820	$ 255,179	$ 59,276
Less: dividends on participating securities	(365)	(356)	(735)	(712)
Basic net income attributable to common shareholders	175,452	39,464	254,444	58,564
Add back dividends on dilutive participating securities	365	0	735	0
Noncontrolling interest in earnings of common unitholders	1,738	356	2,499	526
Diluted net income attributable to common shareholders	$ 177,555	$ 39,820	$ 257,678	$ 59,090
Weighted average number of common shares/units outstanding, Basic	376,020	368,836	374,850	368,513
Weighted average Limited Partner Units outstanding	3,770	3,331	3,673	3,277
Other potential dilutive shares/units	1,831	406	1,811	407
Weighted average number of common shares/units and potential dilutive securities	381,621	372,573	380,334	372,197
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 177,555	$ 40,176	$ 257,678	$ 59,802
Less: dividends on participating securities	(365)	(356)	(735)	(712)
Basic net income attributable to common unitholders	177,190	39,820	256,943	59,090
Add back dividends on dilutive participating securities	365	0	735	0
Diluted net income attributable to common unitholders	$ 177,555	$ 39,820	$ 257,678	$ 59,090
Weighted average number of common shares/units outstanding, Basic	379,790	372,167	378,523	371,790
Other potential dilutive shares/units	1,831	406	1,811	407
Weighted average number of common shares/units and potential dilutive securities	381,621	372,573	380,334	372,197