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Employee service share based compensation allocation of unrecognized period costs capitalized amount.

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Performance percentage criteria.

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Restricted Stock Awards Granted To Vested In Period if performance criteria are met.

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Share based compensation arrangement by share based payment award number of shares previously authorized

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Share Based Compensation Arrangement By Share Based Payment Award Options Cash Received From Options Exercised

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Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period Grant Date Fair Value

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share based compensation shares authorized under stock option plans exercise exercisable options aggregate intrinsic value

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Vesting rate of options

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Unrecognized cost of unvested share-based compensation awards.

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-Topic 718

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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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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 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 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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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Weighted average remaining contractual term for option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan.

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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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Number of share options (or share units) exercised during the current period.

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Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost related to unvested awards	$ 17.4
Unrecognized compensation cost, expect to be capitalized	2.7
Weighted average years over which this cost will be recognized	0 years 9 months 18 days
Maximum number of shares of common stock allowed for the issuance	3,300,000
Incentive Stock Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Maximum number of shares of common stock allowed for the issuance	2,000,000
Stock Appreciation Rights (SARs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, granted	0	0	0
Expire years	10 years
Shares vested	0	0	0
Number of shares, ending balance	131,770	145,901	145,901	145,901
Exercisable options intrinsic value	0
Weighted average remaining contractual term, years	2 years 7 months 6 days
Exercised intrinsic value	0.2
Cash received from the options exercised	0
Weighted average price, ending balance	$ 46.60	$ 46.59	$ 46.59	$ 46.59
Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares, ending balance	935,422
Exercisable options intrinsic value	31.9
Percentage of restricted stock awards to be vested as performance shares to executives	40.00%	30.00%	30.00%
Grant date fair value	24.1	21.3	16.9
Number of Shares, Vested	(319,140)
Exercised intrinsic value	20.2
Restricted stock weighted average remaining contractual term, years	8 months 12 days
Restricted Stock \| Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	2 years
Performance percentage criteria	0.00%
Restricted Stock \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting Period	3 years
Performance percentage criteria	150.00%
Restricted Stock \| First Half of 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted to designated executive officers	71,674
Restricted Stock \| First Half of 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted to designated executive officers		57,405
Restricted Stock \| First Half of 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards granted to designated executive officers			46,441
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire years	10 years
Shares vested	0	0	0
Weighted average remaining contractual term, years	4 months 24 days
Exercised intrinsic value	0.4
Maximum Number of Shares of Common Stock Previously Allowed for the Issuance	2,700,000
Vesting rate of options	20.00%
Cash received from the options exercised	0.4
Options Outstanding	9,500	68,920	118,030	138,980
Weighted average price, ending balance	$ 37.69	$ 37.81	$ 33.03	$ 31.39
Exercisable options intrinsic value	0
Options granted	0	0	0
Number of shares, exercised	(21,490)	(48,110)	(18,850)
Directors Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expire years	10 years
Exercisable options intrinsic value	0
Weighted average remaining contractual term, years	3 years 8 months 12 days
Vesting Period	0 years 6 months
Exercised intrinsic value	0.6
Cash received from the options exercised	$ 0.7
Options Outstanding	150,500	171,500	192,500	199,500
Weighted average price, ending balance	$ 54.18	$ 51.70	$ 49.39	$ 48.37
Director option awards	3,500
Options granted	0	0	0
Number of shares, exercised	(21,000)	(17,500)	(7,000)
2014 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	100.00%
2013 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	100.00%
2012 \| Restricted Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance percentage criteria	100.00%