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Pension and Postretirement Health and Life Benefits (Schedule of Net Benefit Costs) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Curtailment (gains)	$ (0.7)
Defined Benefit Pension Plans [Member]
Service costs	3.7	3.7	7.4	7.3
Interest costs	11.0	12.0	22.0	24.1
Expected return on plan assets (gains)	(12.7)	(13.0)	(25.5)	(26.0)
Amortization of prior service costs	0.5	0.4	0.7	0.8
Amortization of actuarial (gains) losses, net	6.1	4.9	12.2	9.8
Curtailment (gains)	(0.7)		(0.7)
Net benefit costs	7.9	8.0	16.1	16.0
Postretirement Health and Life Benefits Plans [Member]
Service costs	0.9	0.9	1.8	1.8
Interest costs	2.3	2.8	4.5	5.6
Expected return on plan assets (gains)	(0.6)	(0.7)	(1.2)	(1.4)
Amortization of actuarial (gains) losses, net	0.7	1.1	1.4	2.2
Net benefit costs	$ 3.3	$ 4.1	$ 6.5	$ 8.2

X

- Definition

Amount of gain (loss) from a decision to temporarily deviate from the substantive plan, or from a change in benefit obligation or plan asset value from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover or salary scale.

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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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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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- Definition

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 amount of net gain (loss) recognized in net periodic benefit cost as a result of 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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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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