Pension and Other Postretirement Benefit Plans (Details) (USD $) In Millions	3 Months Ended	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Pension [Member]
Components of Net Periodic Benefit Expense [Abstract]
Service Cost	$ 1.9	$ 1.5	$ 5.7	$ 4.6
Interest Cost	6.8	6.6	20.5	19.7
Expected Return on Plan Assets	(8.7)	(8.4)	(26.0)	(25.2)
Amortization of Prior Service Costs	0.1	0.1	0.3	0.3
Amortization of Net Loss	3.1	1.6	9.1	4.9
Amortization of Transition Obligation	0	0	0	0
Net Periodic Benefit Expense	3.2	1.4	9.6	4.3
Contributions			6.6	1.5
Estimated Future Contributions	27		27
Other Postretirement [Member]
Components of Net Periodic Benefit Expense [Abstract]
Service Cost	1.0	1.2	2.9	3.6
Interest Cost	2.7	2.7	8.1	8.2
Expected Return on Plan Assets	(2.4)	(2.4)	(7.3)	(7.2)
Amortization of Prior Service Costs	(0.4)	0	(1.3)	0
Amortization of Net Loss	2.1	1.2	6.4	3.6
Amortization of Transition Obligation	0	0.6	0.1	1.8
Net Periodic Benefit Expense	3.0	3.3	8.9	10.0
Contributions			10.9	12.4
Estimated Future Contributions	1		1
Prescription Drug Reimbursements			$ 0.2

The net increase or decrease of changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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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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The amount of the transition obligation or asset recognized in net periodic benefit cost.

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The increase in the fair value of plan assets from contributions made by the employer.

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The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan in the current remaining fiscal period. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions.

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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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Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan.

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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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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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