Stock-Based Compensation Restricted Stock Unit (Details) - Restricted Stock Units (RSUs) [Member] - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Nonvested stock, beginning of period	884,160	1,328,357	1,089,354
Granted	47,500	56,000	694,250
Vested	(346,651)	(421,375)	(403,116)
Forfeited	(34,485)	(78,822)	(52,131)
Nonvested stock, end of period	550,524	884,160	1,328,357
Nonvested stock, weighted average grant date fair value (in dollars per share)	$ 22.63	$ 22.54	$ 23.43	$ 27.75
Granted, weighted average grant date fair value (in dollars per share)	24.41	16.54	19.26
Vested, weighted average grant date fair value (in dollars per share)	22.86	24.27	27.55
Forfeited, weighted average grant date fair value (in dollars per share)	$ 20.45	$ 24.00	$ 26.40
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Undistributed	235,208
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost	$ 7.8
Nonvested awards, total compensation cost not yet recognized	$ 12.3
Nonvested stock, total compensation cost not yet recognized, period for recognition (in years)	2 years 7 months 10 days
Vested shares, total fair value	$ 7.9	$ 10.2	$ 11.1

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.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

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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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- Definition

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

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-Publisher FASB
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- Definition

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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- Definition

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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- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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No definition available.

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- Definition

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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- Definition

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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Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested, Undistributed

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No definition available.

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