Stock-Based Compensation Outstanding Options and SSARs (Details) (USD $) In Millions, except Share data, unless otherwise specified	6 Months Ended
Jun. 30, 2011 years	Dec. 31, 2010
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Beginning balance	7,580,000
Incentive shares granted	813,000
Options / SSARs exercised	(18,000)
Options / SSARs cancelled	(47,000)
Ending balance	8,328,000
Options / SSARs outstanding Weighted Average Exercise Price	$ 12.82	$ 13.10
SSARs granted Weighted Average Exercise Price	$ 10.12
Options / SSARs exercised Weighted Average Exercise Price	$ 4.93
Options / SSARs cancelled Weighted Average Exercise Price	$ 14.14
Options / SSARs outstanding Weighted Average Contractual Term (in years)	6.8
Options / SSARs outstanding Aggregate Intrinsic Value (in millions)	$ 12.0
Vested and expected to vest	7,912,000
Vested and expected to vest Aggregate Intrinsic Value (in millions)	11.4
Options / SSARs exercisable	6,136,000
Options / SSARs exercisable Weighted Average Exercise Price	$ 14.96
Options / SSARs exercisable Aggregate Intrinsic Value (in millions)	7.5
Stock Options [Member] \| Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Number of months for options to vest at an incremental rate of ten percent for directors	3 months
Options and SSARs [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Weighted-average period of years costs are expected to be recognied over	1.7
Compensation expense related to award	2.7
Unrecognized compensation costs	$ 1.5
Shares available under stock award plans	4,715,177
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Years SSARs become ratably exercisable over	3 years
Years until SSARs expire	P10Y
Director [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested [Roll Forward]
Starting Term When Options Become Exercisable After Grant Date	3 months

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Stock Issued During Period Shares Stock Options and Ssars Exercised

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As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest.

+ References

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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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The date when the equity-based award expires as specified in the award agreement, which may be presented in a variety of ways (for example, year, month and year, day, month and year, quarter of a year).

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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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Equity-based compensation cost during the period with respect to the award, which will be recognized in income (as well as the total recognized tax benefit) or capitalized as part of the cost of an asset.

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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