Share Based and Deferred Compensation Share Based and Deferred Compensation (Details Textuals) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			9 Months Ended		3 Months Ended		9 Months Ended			48 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 Stock Option [Member]	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2013 Stock Option [Member]	Sep. 30, 2012 Stock Option [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member]	Sep. 30, 2012 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Sep. 30, 2013 Restricted Stock [Member] Minimum [Member]	Sep. 30, 2013 Restricted Stock [Member] Maximum [Member]	Sep. 30, 2013 Restricted Performance Share Units Plan [Member] Employees	Sep. 30, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2013 Restricted Performance Share Units Plan [Member] Age Employees	Sep. 30, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2011 Restricted Performance Share Units Plan [Member]	Dec. 31, 2012 Restricted Performance Share Units Plan [Member]	Sep. 30, 2013 Executive Officer [Member] Restricted Stock [Member] Employees	Feb. 25, 2013 Executive Officer [Member] Restricted Stock [Member]	Feb. 25, 2013 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 01, 2012 Executive Officer [Member] Restricted Performance Share Units Plan [Member]	Mar. 02, 2011 Executive Officer [Member] Restricted Performance Share Units Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Voluntary Termination Of Employment Terms											after reaching age 57 and accumulating at least 15 years of service with the Company							after reaching age 57 and accumulating at least 15 years of service with the Company
Accumulated Service Period For Voluntary Termination											15 years							15 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Term, Minimum			3 years								3 years			3 years	7 years			3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period											three to seven years from the initial grant date
Maximum Percentage Of Participants Base Units																		200.00%
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized																							157,208	231,093	242,122	113,256
Number of executives with employment agreements																2		2				2
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value																		$ 4.1	$ 4.2	$ 2.0
Age Limit Of Voluntary Termination Of Employment																		57
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number									563,713		563,713		597,708
Vested/Exerciseable, shares	2,827,517		2,827,517		2,827,517		2,827,517
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition								0 years 4 months 25 days			1 year 4 months 24 days
Share Based Compensation Arrangement By Share Based Payment Stock Options Nonvested Number					184,429		184,429
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized					0.2		0.2		2.4		2.4
Allocated Share-based Compensation Expense	2.3	1.8	7.0	5.5	0.2	0.4	0.6	1.1	0.9	0.8	2.6	2.3				1.3	0.7	3.7	2.1
Employee Service Share-based Compensation, Allocation of Recognized Period Costs, Capitalized Amount	$ 0.3	$ 0.5	$ 1.1	$ 1.4		$ 0.1	$ 0.1	$ 0.3	$ 0.1	$ 0.2	$ 0.4	$ 0.5				$ 0.2	$ 0.2	$ 0.6	$ 0.6
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period											208,306										64,678