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Employee Stock and Incentive Plans (Tables)

12 Months Ended

Dec. 31, 2011

Employee Stock and Incentive Plans [Abstract]

Employee Stock Ownership Plan [Table Text Block]

Year Ended December 31	2011			2010			2009
Millions
ESOP Shares
Allocated	2.2			2.2			2.2
Unallocated	1.0			1.3			1.5
Total	3.2			3.5			3.7
Fair Value of Unallocated Shares		$42.0			$48.4			$49.0

Share-Based Compensation Expense [Table Text Block]

Share-Based Compensation Expense
Year Ended December 31	2011			2010			2009
Millions
Stock Options	—				$0.1			$0.3
Performance Shares		$1.1		1.5			1.5
Restricted Stock Units	0.5			0.6			0.3
Total Share-Based Compensation Expense		$1.6			$2.2			$2.1
Income Tax Benefit		$0.7			$0.9			$0.8

Non-Qualified Stock Options [Table Text Block]

	2011					2010					2009
	Number of Options		Weighted-Average Exercise Price			Number of Options		Weighted-Average Exercise Price			Number of Options		Weighted-Average Exercise Price
Outstanding as of January 1,	560,887			$40.69		646,235			$40.05		672,419			$39.99
Granted (a)	—		—			—		—			—		—
Exercised	80,798			$34.25		40,769			$27.76		4,508			$18.85
Forfeited	19,855			$43.96		44,579			$43.16		21,676			$42.62
Outstanding as of December 31,	460,234			$41.68		560,887			$40.69		646,235			$40.05
Exercisable as of December 31,	460,234			$41.59		523,491			$39.76		512,743			$37.34

(a) Stock options have not been granted since 2008. The weighted-average grant-date intrinsic value of options granted in 2008 was $6.18.

Stock Options, by Exercise Price Range [Table Text Block]

	Range of Exercise Price
As of December 31, 2011	$18.85 to $29.79			$37.76 to $41.35			$44.15 to $48.65
Options Outstanding and Exercisable:
Number Outstanding and Exercisable	11,672			279,133			169,429
Weighted Average Remaining Contractual Life (Years)	1.1			4.5			4.5
Weighted Average Exercise Price		$24.14			$39.57			$46.37

Non-Vested Performance Shares [Table Text Block]

	2011					2010					2009
	Number of Shares		Weighted- Average Grant Date Fair Value			Number of Shares		Weighted- Average Grant Date Fair Value			Number of Shares		Weighted- Average Grant Date Fair Value
Non-vested as of January 1,	122,489			$38.15		121,825			$41.96		79,238			$47.94
Granted (a)	39,312			$41.00		49,302			$35.44		69,800			$35.06
Awarded	(32,368	)		$48.10		—		—			—		—
Unearned Grant Award	—		—			(22,909	)		$54.50		(24,615	)		$41.97
Forfeited	(1,100	)		$34.35		(25,729	)		$36.45		(2,598	)		$38.78
Non-vested as of December 31,	128,333			$28.00		122,489			$38.15		121,825			$41.96

(a)    Shares granted includes accrued dividends.

Restricted Stock Units [Table Text Block]

	2011					2010					2009
	Number of Shares		Weighted- Average Grant Date Fair Value			Number of Shares		Weighted- Average Grant Date Fair Value			Number of Shares		Weighted- Average Grant Date Fair Value
Available as of January 1,	43,803			$30.61		28,983			$29.41		—		—
Granted (a)	20,136			$36.74		26,589			$31.83		30,465			$29.41
Awarded	(215	)		$30.30		(3,091	)		$29.75		—		—
Forfeited	(260	)		$29.41		(8,678	)		$30.62		(1,482	)		$29.41
Available as of December 31,	63,464			$22.88		43,803			$30.61		28,983			$29.41

(a)    Shares granted includes accrued dividends.

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Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits.

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Tabular disclosure of the description of the plan, the basis for determining contributions, including the employee groups covered, and the nature and effect of significant matters affecting comparability of information for all periods presented. For leveraged ESOPs and pension reversion ESOPs, the disclosure may include the basis for releasing shares and how dividends on allocated and unallocated shares are used. Disclosure may also include a description of the accounting policies followed for ESOP transactions, including the method of measuring compensation, the classification of dividends on ESOP shares, and the treatment of ESOP shares for EPS computations. If the employer has both old ESOP shares for which it does not adopt the latest guidance and new ESOP shares for which the new guidance is required, the accounting policies for both blocks of shares may be described. Disclosure may also include he amount of compensation cost recognized during the period, the number of allocated shares, committed-to-be-released shares, and suspense shares held by the ESOP at the balance-sheet date, the fair value of unearned ESOP shares at the balance-sheet date for shares accounted for under the latest guidance, the existence and nature of any repurchase obligation, including disclosure of the fair value of the shares allocated as of the balance sheet date, which are subject to a repurchase obligation.

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Tabular disclosure of the changes in outstanding nonvested performance-based units.

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Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year.

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Tabular disclosure of option exercise prices, by grouped ranges, including the upper and lower limits of the price range, the number of shares under option, weighted average exercise price and remaining contractual option terms.

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