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Stock-Based Compensation (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Stock-Based Compensation
Stock-based compensation expense (in dollars)	$ 4.5	$ 3.7	$ 9.0	$ 8.6
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)			800,000.0
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
2013 Omnibus Plan [Member]
Stock-Based Compensation
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	8,000,000		8,000,000

X

- Definition

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

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

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- Definition

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

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- Definition

Represents the period for meeting performance goals.

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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

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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).

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- Definition

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

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