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Share Based Compensation Arrangement, By Share Based Payment Award Equity Instruments Other Than Options, Grant Date Fair Value

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Share-based Compensation Arrangement by Share-based Payment Award, Term of Plan

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding and Exercisable, Aggregate Intrinsic Value

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Share based compensation arrangement by share based payment award remaining vesting percentage after initial issuance

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Share based compensation arrangement by share based payment award vesting percentage upon annual anniversary

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share based compensation contingently issuable performance share awards

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Share-based Compensation, Shares Authorized under Employee Stock Purchase Plan, Exercise Price Range, Lower Range Limit

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Share Based Compensation Targeted Contingently Issuable Performance Shares at Fair Value

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Share based payment arrangement maximum percentage limitation in any given year

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Share based payment award percentage of target award achieved during the period

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Aggregate number of common shares reserved for future issuance.

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The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years.

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Description of the period of time over which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, which may be expressed in a variety of ways (for example, in years, month and year).

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The discount rate from market value on offering date that participants pay for shares.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan.

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The weighted average price at which option holders acquired shares when converting their stock options into shares under the plan during the reporting period.

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The weighted average price at which grantees could have acquired the underlying shares with respect to stock options of the plan that lapsed during the reporting period.

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The weighted average price as of the beginning of the year at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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Share-Based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended				12 Months Ended				1 Months Ended	12 Months Ended		1 Months Ended	12 Months Ended	1 Months Ended	12 Months Ended						1 Months Ended	12 Months Ended
	Dec. 31, 2011 Years	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2011 Approved by Stockholders [Member]	Dec. 31, 2011 1996 Option Plan [Member]	Dec. 31, 2011 2005 Performance Incentive Plan [Member]	Dec. 31, 2011 2011 Performance Programs [Member] Anniversaries	Dec. 31, 2011 2010 Performance Program [Member]	Jan. 31, 2010 2009 Performance Program [Member]	Dec. 31, 2011 2009 Performance Program [Member]	Dec. 31, 2009 2009 Performance Program [Member]	Jan. 31, 2009 2008 Performance Program [Member]	Dec. 31, 2008 2008 Performance Program [Member]	Jan. 31, 2008 2007 Performance Program [Member]	Dec. 31, 2007 2007 Performance Program [Member]	Dec. 31, 2011 Equity Inducement Plan Restricted Stock Awards [Member]	Dec. 31, 2010 Equity Inducement Plan Restricted Stock Awards [Member]	Dec. 31, 2009 Equity Inducement Plan Restricted Stock Awards [Member]	Dec. 31, 2009 Equity Inducement Plan Restricted Stock Awards Executive One [Member]	Dec. 31, 2009 Equity Inducement Plan Restricted Stock Awards Executive Two [Member]	Jan. 31, 2010 Equity Inducement Plan Performance Share Awards [Member]	Dec. 31, 2011 Equity Inducement Plan Performance Share Awards [Member] Years	Dec. 31, 2009 Equity Inducement Plan Performance Share Awards [Member]	Dec. 31, 2009 Equity Inducement Plan Performance Share Awards Executive One [Member]	Dec. 31, 2009 Equity Inducement Plan Performance Share Awards Executive Two [Member]	Dec. 31, 2009 Equity Inducement Restricted Stock Units [Member]	Dec. 31, 2010 Equity Inducement Restricted Stock Units Executive One [Member]	Dec. 31, 2009 Equity Inducement Restricted Stock Units Executive One [Member]	Dec. 31, 2011 Equity Inducement Restricted Stock Units Executive Two [Member]	Dec. 31, 2009 Equity Inducement Restricted Stock Units Executive Two [Member]	Dec. 31, 2011 Employee Stock Purchase Plan [Member]	Dec. 31, 2010 Employee Stock Purchase Plan [Member]	Dec. 31, 2008 Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)						3,800,000
Share based payment arrangement maximum percentage limitation in any given year (percentage)						2.00%
Share-based compensation share-based payment award qualifying amount for performance award ( in dollars)			$ 91.5								$ 91.5		$ 95.0		$ 85.0
Share based payment award percentage of target award achieved during the period (percentage)							94.00%	95.00%
Share based compensation contingently issuable performance share awards (in dollars)							500,000
Share based compensation targeted contingently issuable performance shares at fair value ( in dollars)							15.8
Share based compensation arrangement by share based payment award remaining vesting percentage after initial issuance (percentage)							50.00%	50.00%		50.00%												50.00%
Share based compensation arrangement by share based payment award vesting percentage upon issuance (percentage)	50.00%						50.00%	50.00%		50.00%
Share-based compensation share-based payment award percentage of performance award achieved (percentage)											100.00%		106.00%		99.25%								100.00%
Share based compensation arrangement by share based payment award vesting percentage upon annual anniversary (ratio)																0.333
Share-based compensation arrangement by share-based payment award, number of anniversaries after initial vesting for remaining vesting							2
Granted (units/shares)								500,000	500,000			200,000		500,000		0	0	100,000	50,000	50,000	55,000		55,000	25,000	30,000	100,000	16,667	50,000	15,300	50,000
Share based compensation arrangement, by share based payment award equity instruments other than options, grant date fair value ( in dollars)								12.0	6.8			3.9		8.1				1.8			1.0
Share based compensation arrangement by share based payment award award vesting period after first year anniversary (in years)																24 months
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized (in dollars)						11.2																0.6
Employee service share-based compensation, nonvested awards, total compensation cost not yet recognized, period for recognition (in years)	1.5																					3.7
Vesting period (in years)	3 years					3 years		24 months		24 months						3 years							24 months
Share-based compensation arrangement by share-based payment award, annual vesting percentage after issuance of remaining vesting, percentage (percentage)							50.00%
Share-based compensation arrangement by share-based payment award, expiration period (in years)					10 years
Share-based compensation arrangement by share-based payment award, offering period term of plan ( in months)																															6 months
Stock Option Plans [Abstract]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Minimum (in years)	3
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period, Maximum (in years)	4
Share-based compensation arrangement by share-based payment award, expiration period (in years)					10 years
Weighted-average exercise price of outstanding options (price per share)	$ 14.62	$ 15.91		$ 15.03	$ 14.76
Share-based compensation arrangement by share-based payment award, options, expirations in period, weighted average exercise price (price per share)	$ 15.74
Share-based compensation arrangement by share-based payment award, options, exercises in period, weighted average exercise price (price per share)	$ 17.32
Share-based compensation arrangement by share-based payment award, options, exercises in period, total intrinsic value ( in dollars)	4.5	8.5	7.1
Share-based compensation arrangement by share-based payment award, options, outstanding and exercisable, aggregate intrinsic value ( in dollars)	$ 5.1
Employee Stock Purchase Plans [Abstract]
Common stock, capital shares reserved for future issuance (in shares)																																	1,500,000
Share-based compensation arrangement by share-based payment award, maximum employee subscription rate (percentage)																															10.00%
Share-based compensation arrangement by share-based payment award, discount from market price, offering date (percentage)																															85.00%
Stock issued during period, shares, employee stock purchase plans (in shares)																															100,000	100,000
Share-based compensation, shares authorized under employee stock purchase plan, exercise price range, lower range limit (price per share)																															$ 23.77	$ 19.98
Share-based compensation, shares authorized under employee stock purchase plan, exercise price range, upper range limit (price per share)																															$ 25.65	$ 22.28