Share-Based Compensation Plans (Performance Based Restricted Stock Units) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2012 Y	Dec. 31, 2011	Dec. 31, 2010
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period	10 years
Weighted Average Exercise Price
Unrecognized compensation costs related to restricted stock units	$ 3.6
Total compensation cost not yet recognized, period for recognition (years)	1.8
PBRSU [Member]
Number of Shares
Unvested restricted stock units outstanding, beginning of period	988,000
PBRSUs granted	347,572	227,860	366,154
PBRSUs vested	103,000
PBRSUs forfeited	(81,000)
Unvested restricted stock units outstanding, end of period	1,152,000	988,000
Weighted Average Exercise Price
Unvested restricted stock units outstanding, beginning balance	$ 17.71
PBRSUs granted	$ 16.12
PBRSUs vested	$ 17.76
PBRSUs forfeited	$ 17.95
Unvested restricted stock units outstanding, ending balance	$ 17.21	$ 17.71
Value of restricted stock awards issued during period, net of forfeitures	5.6	3.7	6.9
Unrecognized compensation costs related to restricted stock units	$ 15.2
Total compensation cost not yet recognized, period for recognition (years)	1.8

Share-based Compensation Arrangement By Share-based Payment Award, Award Vesting Period1

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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.

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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 number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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- Definition

The weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect during the reporting period as a result of the occurrence of a terminating event specified in the contractual agreement of the plan.

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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 weighted average fair value at grant date for nonvested equity-based awards issued 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).

+ References

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement.

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Value of stock related to Restricted Stock Awards issued during the period, net of the stock value of such awards forfeited.

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