Earnings per Share and Unit (Parenthetical) (Details) - shares shares in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2017
ATM Equity Offering Program [Member]
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excludes from earnings per share amount	1.9	1.3
ATM Equity Offering Program [Member] | Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excludes from earnings per share amount	1.9	1.3
Forward Equity Offering [Member]
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excludes from earnings per share amount	1.9	1.3
Forward Equity Offering [Member] | Partnership Interest [Member]
Earnings Per Share Basic [Line Items]
Anti-dilutive securities excludes from earnings per share amount	1.9	1.3