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Share-Based Compensation And Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2011

Share-Based Compensation And Benefit Plans [Abstract]

Schedule Of Share Based Compensation Shares Authorized Under Stock Option Plans By Exercise Price Range And Intrinsic Value

			September 30,				September 30,				September 30,				September 30,
		Outstanding Options (1)								Exercisable Options (1)
Range of Exercise Prices		Number				Weighted Average Price				Number				Weighted Average Price
$30.06-$41.16			470,019			$	32.06				176,314			$	35.39
$42.90-$45.53			466,060				44.32				428,797				44.36
$48.02-$73.32			403,457				51.79				253,068				54.03
Total options			1,339,536			$	42.27				858,179			$	45.37

(1) The aggregate intrinsic value of outstanding and exercisable options at December 31, 2011 was approximately $27.0 million and $14.7 million, respectively. The aggregate intrinsic values were calculated as the excess, if any, between our closing share price of $62.24 per share on December 31, 2011 and the strike price of the underlying award.

Assumptions Used For Options Granted

		September 30,			September 30,
		Year Ended December 31,
		2010		2009
Weighted average fair value of options granted		$11.69		$	3.06
Expected volatility		35.6% – 39.2%			33.0	%
Risk-free interest rate		3.6% – 3.7%			2.6	%
Expected dividend yield		4.1% – 4.4%			9.3	%
Expected life (in years)		7– 9			7

Summary Of Share Incentive Plans

			September 30,				September 30,				September 30,				September 30,
		Options Outstanding				Weighted Average Exercise  / Grant Price				Nonvested Share Awards Outstanding				Weighted Average Exercise  / Grant Price
Options and nonvested share awards outstanding at December 31, 2008			1,536,527			$	44.96				520,285			$	59.40
2009 Activity:
Granted			489,509				30.06				329,018				30.11
Exercised/Vested			(18,521	)			33.45				(188,892	)			53.76
Forfeited			(24,157	)			45.08				(65,258	)			51.06
Net activity			446,831								74,868
Balance at December 31, 2009			1,983,358			$	41.39				595,153			$	46.20
2010 Activity:
Granted			55,895				43.94				372,661				40.05
Exercised/Vested			(141,213	)			32.54				(214,923	)			49.17
Forfeited			(50,904	)			46.65				(11,386	)			39.64
Net activity			(136,222	)							146,352
Balance at December 31, 2010			1,847,136			$	42.37				741,505			$	42.16
2011 Activity:
Granted			—				—				347,084				57.00
Exercised/Vested			(504,838	)			42.59				(243,874	)			47.19
Forfeited			(2,762	)			48.02				(25,961	)			44.51
Net activity			(507,600	)							77,249
Total options and nonvested share awards outstanding at December 31, 2011			1,339,536			$	42.27				818,754			$	46.88

Employee Share Purchase Plan Activity

			September 30,				September 30,				September 30,
		2011				2010				2009
Shares purchased			19,914				29,100				34,649
Weighted average fair value of shares purchased		$	63.29			$	50.70			$	35.68
Expense recorded (in millions)		$	0.3			$	0.5			$	0.4

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- Definition

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 aggregate intrinsic value.

+ References

No definition available.

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- Definition

Tabular disclosure of share-based compensation plans that may be presented in a single table for outstanding, vested and expected to vest, and exercisable awards. The information that may be disclosed in this table may include, but is not limited to, number of shares, weighted average exercise price, weighted average remaining contractual life, and aggregate intrinsic value.

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Tabular disclosure of the number of shares authorized to be purchased, the number of shares purchased at the beginning and end of the period, the number of shares purchased during the period, the weighted-average purchase price of stock purchased under the plan and the weighted average per share fair value of stock purchased under the plan.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

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