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Pension Plan (Narrative) (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended	3 Months Ended
	Jan. 31, 2012	Mar. 31, 2012	Dec. 31, 2011
Pension Plan [Abstract]
Fair value of plan assets		$ 126.2	$ 95.7
Increase in fair value of qualified plan assets		30.5
Increased percent in fair value of qualified plan assets		31.80%
Employer contributions to qualified plan	$ 25.0

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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