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Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Apr. 19, 2021	Dec. 31, 2020
Preferred Stock, Shares Authorized	20,000,000		20,000,000		20,000,000
Preferred Stock, Shares Outstanding	1,302,500		1,302,500		440,000
Preferred Stock, Par or Stated Value Per Share	$ 0.01		$ 0.01		$ 0.01
Series A Corporate Units
Shares Issued, Price Per Share				$ 100
Shares To Be Issued Under Stock Purchase Contracts			35,200,000
Series C Preferred Stock
Shares To Be Issued Under Stock Purchase Contracts			35,200,000
At The Market Program
Common Stock Aggregate Sale Price			$ 750.0
ATM Program Equity Remaining Available for Issuance			300.0
Forward February 21 Member
Forward Contract Indexed to Issuer's Equity, Shares	6,672,740
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share	$ 22.48
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	$ 145.0		$ 145.0
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value			$ 21.73
Forward June 21 Member
Forward Contract Indexed to Issuer's Equity, Shares	5,852,475
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share	$ 25.63
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	$ 146.9		$ 146.9
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value			$ 25.10
Forward August 21 Member
Forward Contract Indexed to Issuer's Equity, Shares	5,941,598
Forward Contract Indexed to Issuer's Equity, Forward Rate Per Share	$ 25.25
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value	$ 148.4		$ 148.4
Forward Contract Indexed to Issuers Equity, Forward Rate Per Share, at Fair Value			$ 24.97
Series A Preferred Stock
Preferred Stock, Shares Outstanding	400,000		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		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		20,000
Series C Preferred Stock
Preferred Stock, Shares Outstanding	862,500		862,500
Preferred Stock, Par or Stated Value Per Share				$ 0.01
Undivided Beneficial Ownership Interest, Percent				10.00%

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