Capital Markets (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Class of Stock [Line Items]
Common Stock, Dividends, Per Share, Declared			$ 1.5150
Stock Repurchase Program, Authorized Amount	$ 150.0		$ 150.0
Number of common shares repurchased			4,066,716
Treasury Stock, Value, Acquired, Cost Method			$ 106.0
Series C Preferred Shares [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.359375		$ 1.078125
Preferred Stock, Dividend Rate, Percentage	5.75%	5.75%	5.75%	5.75%
Series E Preferred Shares [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.5625		$ 1.6875
Preferred Stock, Dividend Rate, Percentage	9.00%	9.00%	9.00%	9.00%
Series G Preferred Stock [Member]
Class of Stock [Line Items]
Preferred Stock, Dividends Per Share, Declared	$ 0.359375		$ 1.078125