Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Share-Based Compensation [Line Items]
Number of shares of common stock exchanged for each award	1
Restricted stock units [Member]
Share-Based Compensation [Line Items]
Aggregate number of shares approved	6,228,430
Compensation expense	$ 5.6	$ 3.9
Unrecognized compensation cost related to the unvested awards	19.9
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 6 months
Granted, weighted average grant date fair value (in dollars per share)	$ 23.35	$ 27.33
Forfeited (in shares)	1,560
Weighted average grant date fair value	$ 23.35
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares)	35,000
Number of unvested stock awards that will vest subject to the satisfaction of service-based requirements (in shares)	1,685,097
Restricted stock units [Member] \| Awarded in 2014, 2013 and 2012 [Member]
Share-Based Compensation [Line Items]
Number of restricted stock units for which performance targets are established (in shares)		866,500
Restricted stock units [Member] \| Awarded in 2015, 2014, and 2013 [Member]
Share-Based Compensation [Line Items]
Number of restricted stock units for which performance targets are established (in shares)	291,500
Stock Options [Member]
Share-Based Compensation [Line Items]
Aggregate number of shares approved	3,385,465
Granted (in shares)	259,000
Compensation expense	3.6	1.5
Unrecognized compensation cost related to the unvested awards	7.5
Weighted average period over which unrecognized compensation cost is expected to be recognized	2 years 4 months 24 days
Granted, weighted average grant date fair value (in dollars per share)	$ 12.64	$ 17.69
Weighted average grant date fair value	$ 12.64
Term of stock options	10 years
Number of vested and exercisable stock options (in shares)	1,485,000
Vested and exercisable stock options, weighted average exercise price (in dollars per share)	$ 19.57
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements (in shares)	475,000
Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics (in shares)	2,450,000
Outstanding shares	2,248,000
Intrinsic value of outstanding stock options	$ 11.2
Weighted average remaining contractual term of outstanding stock options	5 years 10 months 24 days
Stock Options [Member] \| Awarded in 2014, 2013 and 2012 [Member]
Share-Based Compensation [Line Items]
Number of stock option awards subject to performance targets (in shares)		714,000
Stock Options [Member] \| Awarded in 2015, 2014, 2013, And 2012 [Member]
Share-Based Compensation [Line Items]
Number of stock option awards subject to performance targets (in shares)	259,000
Plan [Member]
Share-Based Compensation [Line Items]
Number of shares authorized for grant	8,500,000
Number of shares available for future grant (in shares)	114,928

Refers to the number of restricted stock units for which performance targets established.

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This line item represents the number of shares of common stock which are exchanged upon the vesting of the restricted stock unit awards.

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Number of stock option awards subject to the achievement of pre-tax income performance targets established by the Compensation Committee.

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Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements.

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Number of unvested stock option awards that will vest subject to the satisfaction of service-based requirements and the achievement of performance metrics.

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Represents the total number of awards approved to date by the Compensation Committee of the Company's Board of Directors.

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Number of options which are granted and outstanding before approved for grant as of the date of balance sheet.

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Number of unvested stock option awards will vest based on the satisfaction of both service requirements and the achievement of performance metrics.

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Number of unvested stock option awards will vest based on the satisfaction of service requirements.

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

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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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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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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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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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