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Long-term Equity-based Compensation - Activity Related to Nonvested Restricted Stock (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended						0 Months Ended	36 Months Ended
	Dec. 31, 2013 Restricted Stock [Member]	Dec. 31, 2012 Restricted Stock [Member]	Dec. 31, 2011 Restricted Stock [Member]	Dec. 31, 2013 Time Vested Restricted Stock [Member]	Dec. 31, 2013 Performance Based Restricted Stock [Member]	Dec. 31, 2013 Performance Period, 2012 to 2014 [Member] Performance Based Restricted Stock [Member]	Feb. 01, 2014 Performance Period, 2011 to 2013 [Member] Performance Based Restricted Stock [Member]	Dec. 31, 2013 Performance Period, 2011 to 2013 [Member] Performance Based Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested Balance at Beginning of Year, Restricted Shares				126,349	187,075
Nonvested at Beginning of Year, Weighted Average Grant Date Fair Value				$ 26.19	$ 36.70
Grants in Period				75,625	70,675
Grants in Period, Weighted Average Grant Date Fair Value				$ 33.33	$ 42.12
Vested in Period				(59,065)	(53,118)
Vested in Period, Weighted Average Grant Date Fair Value				$ 24.99	$ 33.14
Forfeited in Period				(41,282)	(27,832)
Forfeited in Period, Weighted Average Grant Date Fair Value				$ 27.98	$ 39.16
Nonvested Balance at End of Year, Restricted Shares				101,627	176,800
Nonvested at End of Year, Weighted Average Grant Date Fair Value				$ 31.48	$ 39.54
Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded						59,775
Reduction in Share Authorization if Maximum Performance Level is Met or Exceeded					390,486	179,325
Payout Percentage for Exceeding Performance Target								118.00%
Stock Issued During Period, Shares, Share-based Compensation, Net of Forfeitures							9,014
Vested in Period, Total Fair Value	$ 4.1	$ 4.0	$ 1.4
Adjustments to Additional Paid in Capital, Income Tax Benefit from Share-based Compensation	$ 1.4	$ 1.4	$ 0.5

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Number of Additional Shares To Be Granted If Maximum Perfornance Level Is Met or Exceeded

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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Tax Benefits

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

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(iv)(3)

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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 as a result of the occurrence of a terminating event.

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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).

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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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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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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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Number of shares (or other type of equity) issued during the period as a result of any equity-based compensation plan other than an employee stock ownership plan (ESOP), net of any shares forfeited. Shares issued could result from the issuance of restricted stock, the exercise of stock options, stock issued under employee stock purchase plans, and/or other employee benefit plans.

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-Number 210

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