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Employee Benefit Plans - Reconciliation of Changes in Fair Value Measurement of Plan Assets (Details) (Hedge Funds [Member], Significant Unobservable Inputs (Level 3) [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Hedge Funds [Member] \| Significant Unobservable Inputs (Level 3) [Member]
Reconciliation of changes in fair value measurements of plan assets [Rollforward]
Beginning fair value	$ 4.0	$ 3.9
Purchases, sales, and settlements	0	0
Actual return on plan assets still held at reporting date	0.6	0.1
Ending fair value	$ 4.6	$ 4.0

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

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