Stock Compensation Plans (Details 4) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Nonvested stock awards, Weighted-Average Grant Date Fair Value
Income tax benefit related to stock-based compensation	$ 1.0	$ 0.9	$ 0.9
Future compensation cost related to nonvested awards	3.7
Weighted-average period over which future compensation cost is expected to be recognized	2 years
Selling, general and administrative expense
Nonvested stock awards, Weighted-Average Grant Date Fair Value
Share-based compensation expense	3.1	2.4	2.6
Restricted Stock Awards
Summary of non-vested stock awards
Nonvested at the beginning of the period (in shares)	197,844
Granted (in shares)	126,588
Vested (in shares)	(94,005)
Forfeited (in shares)	(7,674)
Nonvested at the end of the period (in shares)	222,753	197,844
Nonvested stock awards, Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 14.92
Granted (in dollars per share)	$ 17.11	$ 14.56	$ 14.88
Vested (in dollars per share)	$ 15.28
Forfeited (in dollars per share)	$ 15.54
Nonvested at the end of the period (in dollars per share)	$ 15.99	$ 14.92
Total grant date fair value amount of awards granted	2.2	2.0	1.4
Total fair value amount of awards vested	1.4	1.9	1.6
Performance Stock Awards \| ROC Performance Stock Awards
Summary of non-vested stock awards
Nonvested at the beginning of the period (in shares)	56,588
Granted (in shares)	34,788
Vested (in shares)		0	0
Forfeited (in shares)	(32,988)
Nonvested at the end of the period (in shares)	58,388	56,588
Nonvested stock awards, Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 14.35
Granted (in dollars per share)	$ 17.09	$ 14.94	$ 13.57
Forfeited (in dollars per share)	$ 14.62
Nonvested at the end of the period (in dollars per share)	$ 15.83	$ 14.35
Total grant date fair value amount of awards granted	0.6	0.5	0.3
Share-based compensation expense	0	0	0
Performance Stock Awards \| TSR Performance Stock Award
Summary of non-vested stock awards
Nonvested at the beginning of the period (in shares)	67,723
Granted (in shares)	27,251
Forfeited (in shares)	(45,460)
Nonvested at the end of the period (in shares)	49,514	67,723
Nonvested stock awards, Weighted-Average Grant Date Fair Value
Nonvested at the beginning of the period (in dollars per share)	$ 17.70
Granted (in dollars per share)	$ 21.92	$ 15.31	$ 15.58
Forfeited (in dollars per share)	$ 19.12
Nonvested at the end of the period (in dollars per share)	$ 18.72	$ 17.70
Total grant date fair value amount of awards granted	0.6	0.5	0.3
Total fair value amount of awards vested	$ 0	$ 0	$ 0.5

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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Unrecognized cost of unvested share-based compensation awards.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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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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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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Value, before forfeitures, of stock or other type of equity granted of any equity-based compensation plan other than an employee stock ownership plan (ESOP).

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