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Stock-based Compensation Plans (Stock-based Compensation) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Exercisable at period end, shares	6,200,000			7,300,000
Weighted-average grant date fair value	$ 8.47		$ 6.87
Weighted-average risk-free interest rates	1.09%		1.15%
Dividend yield	0.00%		0.00%
Expected term	6 years 3 months		6 years 6 months
Weighted-average volatility	48.60%		55.50%
Compensation expense	$ 4.4		$ 0.7
Stock options [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]
Outstanding at December 31, 2012 (shares)	12,379,000
Granted (shares)	1,282,000
Exercised (shares)	(1,212,000)
Forfeited or expired (shares)	(243,000)
Outstanding at March 31, 2013 (shares)	12,206,000
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2012 (per share)	299,000
Granted (shares)	219,000
Vested (shares)	(3,000)
Forfeited or expired (shares)	(10,000)
Outstanding at March 31, 2013 (per share)	505,000
Performance-Based Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting period	4 years
Share-based compensation arrangement by share-based payment award vesting percentage	25.00%
Share-based compensation arrangement by share-based payment award number of stock units that would be issued on vesting of shares	1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]
Outstanding at December 31, 2012 (per share)	0	[1]
Granted (shares)	52,000	[1]
Vested (shares)	0	[1]
Forfeited or expired (shares)	(4,000)	[1]
Outstanding at March 31, 2013 (per share)	48,000	[1]
Minimum [Member] | Performance-Based Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award vesting percentage	0.00%
Maximum [Member] | Performance-Based Share Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based compensation arrangement by share-based payment award vesting percentage	200.00%
[1] Share unit amounts represent the target number of PSUs considered granted for accounting recognition based on the establishment of performance targets for future years. The actual number of shares that will be earned upon vesting is dependent upon actual performance and may range from zero to 200% of the target number of shares.

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Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares That Would Be Issued on Vesting of Stock Units

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Period 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, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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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 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 estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Expected term of share-based compensation awards, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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The range of expected volatilities used and the weighted-average expected volatility for an entity using a valuation technique with different volatilities during the contractual term.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The number of shares reserved for issuance under stock option agreements awarded under the plan that validly exist and are outstanding as of the balance sheet date, including vested options.

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Number of share options (or share units) exercised during the current period.

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