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Pension and Other Post-Retirement Benefits (Details 10) (Real Estate Investment [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Summary of changes in the fair value of the Plan's Level 3 assets
Plan assets at end of year	$ 17.9	$ 13.9
Fair Value, Inputs, Level 3 [Member]
Summary of changes in the fair value of the Plan's Level 3 assets
Plan assets at beginning of year	13.9	12.7
Income	0.6	0.8
Realized losses	0	(0.7)
Unrealized change in fair value of investments	1.5	1.1
Purchases	1.9
Plan assets at end of year	$ 17.9	$ 13.9

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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