Dividends (Tables)

12 Months Ended

Dec. 31, 2011

Dividends [Abstract]

Schedule of Dividends Declared and Paid Per Share

The following table provides a summary of dividends declared and paid per share:

	Year Ended December 31,
	2011				2010				2009
	Declared		Paid		Declared		Paid		Declared		Paid
Common shares	$	2.720	$	2.700	$	2.660	$	2.650	$	2.620	$	2.610
5.417% Series 1 Cumulative Convertible Preferred shares	$	1.354	$	1.354	$	1.354	$	1.354	$	1.354	$	1.354

Schedule Of Income Tax Status Of Dividends Paid

A summary of the income tax status of dividends per share paid is as follows:

	Year Ended December 31,
	2011		2010		2009
Common shares
Ordinary dividend	$	2.349	$	2.519	$	2.377
Ordinary dividend eligible for 15% rate	0.027		0.025		0.024
Return of capital	0.162		0.106		0.183
Capital gain	0.162		—		0.026
	$	2.700	$	2.650	$	2.610
5.417% Series 1 Cumulative Convertible Preferred shares
Ordinary dividend	1.246		1.341		1.246
Ordinary dividend eligible for 15% rate	0.013		0.013		0.095
Capital gain	0.095		—		0.013
	$	1.354	$	1.354	$	1.354