Stock-Based Awards and Programs (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Stock-Based Awards and Programs
Unrecognized compensation expense	$ 1,100,000		$ 1,100,000		$ 1,100,000
Compensation Expense	504,000	363,000	2,372,000	2,057,000	2,875,000	2,305,000
Tax Benefit Recognized	$ 180,000	$ 127,000	$ 870,000	$ 743,000	$ 1,050,000	$ 821,000
Employee Stock Purchase Plan
Changes in restricted stock awards
Nonvested, balance at the end of the period (in shares)	57,915	62,793	57,915	62,793	57,915	62,793
Assumptions for valuation of shares
Weighted average fair value of grants (in dollars per share)			$ 3.07	$ 2.78
Risk-free interest rate (as a percent)			0.10%	0.14%
Expected dividend yield (as a percent)			4.30%	4.60%
Expected volatility (as a percent)			14.00%	14.00%
Expected life			12 months	12 months
Performance-Based Restricted Stock Awards
Changes in restricted stock awards
Nonvested, balance at the beginning of the period (in shares)			47,200,000	33,900,000
Granted (in shares)			27,000,000	26,300,000
Awarded (in shares)			0	(4,460,000)
Not Awarded (in shares)			(10,900,000)	(8,540,000)
Nonvested, balance at the end of the period (in shares)	63,300,000	47,200,000	63,300,000	47,200,000	63,300,000	47,200,000
Weighted Average Grant Date Price
Nonvested, balance at the beginning of the period (in dollars per share)			$ 21.39	$ 20.25
Granted (in dollars per share)			$ 22.40	$ 21.36
Distributed (in dollars per share)			$ 21.84	$ 18.36
Not Awarded (in dollars per share)			$ 21.84	$ 18.36
Nonvested, balance at the end of the period (in dollars per share)	$ 21.74	$ 21.39	$ 21.74	$ 21.39	$ 21.74	$ 21.39
Time-Vested Restricted Stock Awards
Assumptions used for estimating fair value of grants outstanding
Vesting period			3 years
Period from date of termination of employment due to death, retirement or disability during which the pro-rata portion of the awards are distributed			6 months
Changes in restricted stock awards
Nonvested, balance at the beginning of the period (in shares)			24,900,000	3,300,000
Granted (in shares)			22,600,000	21,600,000
Distributed (in shares)			(4,010,000)
Forfeited (in shares)			(2,490,000)
Nonvested, balance at the end of the period (in shares)	41,000,000	24,900,000	41,000,000	24,900,000	41,000,000	24,900,000
Weighted Average Grant Date Price
Nonvested, balance at the beginning of the period (in dollars per share)			$ 22.69	$ 20.38
Granted (in dollars per share)			$ 22.40	$ 21.36
Distributed (in dollars per share)			$ 22.98
Nonvested, balance at the end of the period (in dollars per share)	$ 24.15	$ 21.66	$ 24.15	$ 21.66	$ 24.15	$ 21.66