Share Based and Deferred Compensation Restricted Performance Share Units (Details) (Restricted Performance Share Units Plan [Member], USD $)	0 Months Ended	3 Months Ended		9 Months Ended		0 Months Ended			12 Months Ended		9 Months Ended		0 Months Ended
	Mar. 01, 2014	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Mar. 11, 2014 Executive Officer [Member]	Mar. 12, 2014 Executive Officer [Member]	Mar. 01, 2012 Executive Officer [Member]	Feb. 25, 2014 Executive Officer [Member]	Feb. 25, 2013 Executive Officer [Member]	Sep. 30, 2014 Executive Officer [Member] Original Grant [Member]		Oct. 31, 2012 Executive Officer [Member] Dividend equivalent shares vested [Member]	Oct. 31, 2012 Executive Officer [Member] Total vested [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Age Limit Of Voluntary Termination Of Employment											57
Share-based Compensation Arrangement by Share-based Payment Award, Award Requisite Service Period											15 years
Allocated Share-based Compensation Expense		$ 500,000	$ 1,300,000	$ 2,800,000	$ 3,700,000
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost		200,000	200,000	900,000	600,000
Fair Value of Units on Grant Date						2,624,000	1,225,000	4,273,000	4,137,000
Units Granted						134,284	61,720	265,222.00		231,093
Units Canceled								38,959.00	27,698.00
Units Vested	(150,829)										(14,742.00)	[1]
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period													563	30,610
Unvested Balance						134,284.00	61,720.00	211,521.00		203,395.00
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized		$ 2,700,000		$ 2,700,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition				1 year 2 months 2 days

[1] (a) These RPSUs were settled upon the holder’s qualifying retirement in October 2012 after reaching age 57 and accumulating at least 15 years of service with the Company. Of the 14,742 RPSU's originally granted, 563 dividend equivalent rights had accrued at the time of qualifying retirement. In accordance with the pay-out formula in the award agreement, on October 31, 2012, the Company issued 30,610 common shares in settlement of the RPSU's based on the Company’s total shareholder return relative to the comparator groups.