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Pension and Other Post-Retirement Benefits (Details 9) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Short-term investment funds [Member]
Fair value of pension plan assets
Assets	$ 4.3	$ 4.0
Short-term investment funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	4.3	4.0
Short-term investment funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	0	0
Short-term investment funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets	0	0
Common Stock [Member]
Fair value of pension plan assets
Assets	8.9	10.7
Common Stock [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	8.9	10.7
Common Stock [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	0	0
Common Stock [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets	0	0
Stock collective funds [Member]
Fair value of pension plan assets
Assets	222.5	243.8
Stock collective funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	0
Stock collective funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	222.5	243.8
Stock collective funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets	0	0
Fixed income collective trust funds [Member]
Fair value of pension plan assets
Assets	125.3	120.3
Fixed income collective trust funds [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	0
Fixed income collective trust funds [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	125.3	120.3
Fixed income collective trust funds [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets	0	0
Real Estate Investment [Member]
Fair value of pension plan assets
Assets	17.9	13.9
Real Estate Investment [Member] \| Fair Value, Inputs, Level 1 [Member]
Fair value of pension plan assets
Assets	0	0
Real Estate Investment [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of pension plan assets
Assets	0	0
Real Estate Investment [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of pension plan assets
Assets	$ 17.9	$ 13.9	$ 12.7

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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