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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Preferred Stock, Shares Authorized	20,000,000		20,000,000
Preferred Stock, Shares Outstanding	440,000		440,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01
At The Market Program
Common Stock Aggregate Sale Price	$ 750.0
ATM Program Equity Remaining Available for Issuance	$ 600.0
Forward February 21 Member
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share	$ 22.48
Forward Contract Indexed to Issuer's Equity, Shares	6,672,740
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	$ 148.5
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value	$ 22.25
Series A Preferred Stock
Preferred Stock, Shares Outstanding	400,000
Preferred Stock, Amount of Preferred Dividends in Arrears	$ 6.7	$ 6.7
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears	$ 16.63	$ 16.63
Series B Preferred Stock
Preferred Stock, Shares Outstanding	20,000
Preferred Stock, Amount of Preferred Dividends in Arrears	$ 1.4	$ 1.4
Preferred Stock, Per Share Amounts of Preferred Dividends in Arrears	$ 72.23	$ 72.23
Series B-1 Preferred Stock
Preferred Stock, Shares Outstanding	20,000

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