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Pension and Post-retirement Plans (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012	Jun. 30, 2012 Pension Benefits [Member]	Jun. 30, 2011 Pension Benefits [Member]	Jun. 30, 2012 Post-retirement Benefits [Member]	Jun. 30, 2011 Post-retirement Benefits [Member]
Components of net periodic benefit cost [Abstract]
Service cost			$ 1.3	$ 2.8	$ 0.4	$ 0.4
Interest cost			4.5	5.4	1.1	1.4
Expected return on plan assets			(5.3)	(5.6)
Amortization of prior service cost			(0.7)			0.1
Amortization of net (gain) loss			4.3	2.0	0.9	1.0
Net periodic benefit cost			4.1	4.6	2.4	2.9
Cash contributed to pension plan	10.9	10.9
Estimated full year cash contributions to pension plan	$ 2.4	$ 13.3

X

- Definition

Represents the amount of cash contributed to the pension plan as of the balance sheet date.

+ References

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- Definition

An estimate of cash contributions to the pension plan for the entire fiscal year.

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- Definition

The amount of gains or losses recognized in net periodic benefit cost.

+ References

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- Definition

The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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- Definition

An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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- Definition

The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time.

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The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments.

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- Definition

The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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