Equity And Accumulated Other Comprehensive Income (Loss), Net (7.375% Series H Cumulative Redeemable Preferred Stock Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified			0 Months Ended	3 Months Ended	12 Months Ended	0 Months Ended
	Mar. 31, 2014	Apr. 07, 2014 Subsequent Event [Member]	Mar. 26, 2014 Series H Cumulative Convertible Preferred Stock/Units [Member]	Mar. 31, 2014 Series H Cumulative Convertible Preferred Stock/Units [Member]	Dec. 31, 2013 Series H Cumulative Convertible Preferred Stock/Units [Member]	Apr. 29, 2014 Series H Cumulative Convertible Preferred Stock/Units [Member] Subsequent Event [Member]	Apr. 07, 2014 Series H Cumulative Convertible Preferred Stock/Units [Member] Subsequent Event [Member]	Apr. 07, 2014 Series H Cumulative Convertible Preferred Stock/Units [Member] Over-Allotment Option [Member] Subsequent Event [Member]
Equity and Accumulated Other Comprehensive Income (Loss) [Line Items]
Issuance date				Mar. 26, 2014
Preferred stock, issued		2,000,000		12,000,000	0		14,600,000	600,000
Preferred stock, dividend rate				7.375%	7.375%
Gross proceeds from issuance of redeemable preferred stock			$ 289.9	$ 353.2
Preferred stock dividend per share amount				$ 1.84375		$ 1.844
Preferred stock dividend declared per share				$ 0.48655
Preferred stock, liquidation preference per share/unit				$ 25.00	$ 25.00
Preferred stock, redemption price per share				$ 25.00
Shares issued upon conversion	0.9632