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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Stock-Based Compensation
Stock-based compensation expense (in dollars)	$ 4.5	$ 4.9
Stock Options
Stock-Based Compensation
Number of share options granted during the period (in shares)	400,000	700,000
Restricted Stock
Stock-Based Compensation
Number of shares of other than options granted during the period (in shares)	100,000.0	200,000.0
Expiration period of restrictions (in years)	third anniversary
Performance shares | Performance Plan 2013 [Member]
Stock-Based Compensation
Percentage of shares paid based on total shareholder return relative to peer group of companies	50.00%
Period for meeting performance goals (in years)	3 years
Percentage of shares based on debt reduction for performance goals	50.00%
Performance shares | Performance Plan 2013 [Member] | Minimum
Stock-Based Compensation
Number of shares of other than options granted during the period (in shares)	0.0
Performance shares | Performance Plan 2013 [Member] | Maximum
Stock-Based Compensation
Number of shares of other than options granted during the period (in shares)	1,000,000.0
Performance shares | Performance Plan 2012
Stock-Based Compensation
Percentage of shares paid based on total shareholder return relative to peer group of companies	50.00%
Period for meeting performance goals (in years)	3 years
Percentage of shares paid based on improvement in total leverage ratio	50.00%
Performance shares | Performance Plan 2012 | Minimum
Stock-Based Compensation
Number of shares of other than options granted during the period (in shares)	0.0
Performance shares | Performance Plan 2012 | Maximum
Stock-Based Compensation
Number of shares of other than options granted during the period (in shares)	700,000.0

X

- Definition

The date when the restrictions on the equity-based award expires as specified in the award agreement.

+ References

No definition available.

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Percentage Shares Granted Based on Improvement in Company Total Leverage Ratio

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Share-based Compensation Arrangement by Share-based Payment Award, Percentage Shares Granted Based on Total Shareholder Return Relative to Peer Group of Companies

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X

- Definition

Represents the percentage of shares based on debt reduction for performance goals.

+ References

No definition available.

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- Definition

Represents the period for meeting performance goals.

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No definition available.

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- Definition

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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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-Paragraph A240

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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- Definition

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).

+ References

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

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- Definition

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

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

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