Stock-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	12 Months Ended
Dec. 31, 2014 Y
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Retirement eligible age under the plan	62
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	$ 43.6
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition	1 year 2 months
Shares reserved to satisfy existing awards (in shares)	3,300,000
Shares available for future awards (in shares)	20,300,000
Share-based compensation arrangement by share-based payment award, award measurement period beginning in Two Thousand and Fourteen	3 years
Share-based compensation arrangement by share-based payment award, award measurement period prior Two Thousand and Fourteen	1 year
Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service	3 years
Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service	4 years
Incentive compensation and stock plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized for awards (in shares)	48,000,000
Shares converted to common stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares authorized for awards (in shares)	18,000,000
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of stock units outstanding to active and nonemployee directors (in units)	861,000
Restricted Stock Units (RSUs) \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service	3 years
Restricted Stock Units (RSUs) \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting service	4 years
Performance shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout shares (in shares)	342,000
Vesting date	January 2017
Market based award \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout shares (in shares)	0
Market based award \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected payout shares (in shares)	172,000
Subsequent event information
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting date	1/2/2015
Restricted stock awards vested and issued subsequent event
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares issued to employees under restricted stock awards (in shares)	500,000

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Share-based compensation arrangement by share-based payment award, actual expected payout in shares on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). Performance period ending at fiscal year end.

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Period over which the actual payout of shares related to market-based awards are being measured beginning in Two Thousand and Fourteen.

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Original period over which the actual payout of shares related to market-based awards are being measured.

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Share based compensation current year awards, vesting date.

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Stock-based compensation plan, eligible retirement age of employee at which time stock-based compensation vests.

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Number of common shares reserved for future issuance related to deferred compensation arrangements with individuals.

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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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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, 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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Total number of shares issued during the period, including shares forfeited, as a result of Restricted Stock Awards.

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