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Share based compensation arrangement by share based payment award award vesting period to non employees.

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Share based compensation arrangement by share based payment award compensation expense period.

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Share based compensation arrangement by share based payment award options employee receive cash or stock awards period.

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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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Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements.

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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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Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period.

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Face amount per share of no-par value preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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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 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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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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Common Stock and Stock-based Compensation (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Common Stock and Stock-based Compensation (Textual) [Abstract]
Serial preferred stock, shares authorized	5,000,000us-gaap_PreferredStockSharesAuthorized	5,000,000us-gaap_PreferredStockSharesAuthorized
Serial preferred stock, par value
Serial preferred stock, shares issued
Stock Options [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights vested period	4 years
Expire period of option rights granted to non employees	10 years
Total cash received from the exercise of stock options	$ 0.4	$ 1.2	$ 0.2
Tax benefit realized from tax deductions	0.1	0.5	0.1
Total intrinsic value of options exercised	0.3	1.0	0.3
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Amortization period	3 years
Amount of weighted average grant date fair value	$ 33.29	$ 27.35	$ 27.87
Compensation cost	2.2	2.5	2.7
Unvested outstanding options	1.8
Expected amortization weighted average period	20 months
Tax benefit from vesting of restricted stock	0.1	0.2	0.7
Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights vested period	3 years
Amount of weighted average grant date fair value	$ 33.29
Compensation cost	2.2	2.4	2.8
Unvested outstanding options	2.2
Basis of risk-free rate of return	5 years
Duration of month-end Company share closing prices prior to granting of SARs used in calculating share price volatility	10 years
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices One [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 15.01
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Two [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 21.24
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Three [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 24.03
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Four [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 27.78
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Five [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 34.70
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Six [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 39.30
Stock Appreciation Rights (SARs) [Member] \| Range of Exercise Prices Seven [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock appreciation rights granted	$ 44.72
Long Term Incentive Plans [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost	$ 1.0	$ 0.8	$ 0.4
Period in which employees receive cash or stock awards	3 years
Compensation expense plan period	3 years
Deferred Directors Compensation Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire period of option rights granted to non employees	10 years
Exercisable short term period of option rights granted to non employees	6 months
Amount of weighted average grant date fair value	$ 33.46	$ 26.99	$ 23.10
Granted Prior To 2011 [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire period of option rights granted to non employees	10 years
Granted in 2011 and Later [Member] \| Stock Appreciation Rights (SARs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire period of option rights granted to non employees	7 years