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Pension and Postretirement Health and Life Benefits (Pension and Postretirement Health and Life Benefits) (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Curtailment losses			$ 5.1
Defined Benefit Pension Plans [Member]
Service costs	4.0	4.8	12.0	14.5
Interest costs	12.6	12.3	37.7	36.7
Expected return on plan assets (gains)	(13.5)	(12.2)	(40.4)	(36.6)
Amortization of prior service costs (credits)	0.4	0.4	1.2	1.3
Amortization of actuarial losses	2.2	4.0	6.9	12.0
Curtailment losses			3.2
Net benefit costs	5.7	9.3	20.6	27.9
Postretirement Health and Life Benefits Plans [Member]
Service costs	0.7	1.2	3.4	3.7
Interest costs	2.9	3.0	9.0	8.9
Expected return on plan assets (gains)	(1.0)	(0.9)	(2.8)	(2.7)
Amortization of prior service costs (credits)		(2.1)		(6.3)
Amortization of actuarial losses	0.7	0.7	2.0	2.0
Curtailment losses			1.9
Net benefit costs	$ 3.3	$ 1.9	$ 13.5	$ 5.6

X

- Definition

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 decrease that is related to an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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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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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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