Pension (Sensitivity Analysis) (Details) (USD $)	12 Months Ended
Dec. 31, 2014
Compensation and Retirement Disclosure [Abstract]
Projected benefit obligation increase due to change in mortality rate assumption	$ 22,100,000
Discount rate, estimated effect on annual expense, 2014	4,600,000
Discount rate, estimated effect on annual expense, 2015	5,100,000
Long-term rate of return on assets, estimated effect on annual expense, 2014	3,800,000
Long-term rate of return on assets, estimated effect on annual expense, 2015	$ 3,900,000

Defined Benefit Plan, Effect of One Percentage Point Decrease in Discount Rate on Pension Expense, Current Period

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Defined Benefit Plan, Effect of One Percentage Point Decrease in Discount Rate on Pension Expense, Next 12 Months

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Defined Benefit Plan, Effect of One Percentage Point Decrease in Long-term Rate of Return on Pension Expense, Current Period

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Defined Benefit Plan, Effect of One Percentage Point Decrease in Long-term Rate of Return on Pension Expense, Next 12 Months

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Defined Benefit Plan, Projected Benefit Obligation, Period Increase (Decrease) due to Change in Mortality Rate Assumption Used

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