Pension Benefits - Changes in Fair Value of Plan Assets and Changes in Accumulated Benefit Obligations (Details) (Pension Plans, Defined Benefit [Member], USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Pension Plans, Defined Benefit [Member]
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]
Fair Value of Plan Assets at Beginning of Year	$ 441.3	$ 352.7
Actual Return on Plan Assets	38.0	25.6
Employer Contributions	0	83.7
Plan Participants' Contributions	0	0.1
Benefits Paid	(21.5)	(20.4)
Settlement Benefits	(0.2)	(0.4)
Fair Value of Plan Assets at End of Year	457.6	441.3
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at Beginning of Year	499.2	433.1
Service Cost	10.8	10.2
Interest Cost	22.4	22.9
Plan Participants' Contributions	0	0.1
Benefits Paid	(21.5)	(20.4)
Settlement Benefits	(0.2)	(0.4)
Actuarial Losses	(43.2)	(53.7)
Benefit Obligations at End Of Year	553.9	499.2
Funded Status - Benefit Obligation In Excess of Plan Assets	(96.3)	(57.9)
Amount Recognized in Accumulated Other Comprehensive Income:
Accumulated Actuarial Loss	(166.4)	(150.4)
Prior Service Cost	0.1	0.2
Amount Recognized in Accumulated Other Comprehensive Income	(166.3)	(150.2)
Accumulated Benefit Obligation	$ 531.3	$ 480.5

Pension Benefits - Changes in Fair Value of Plan Assets and Changes in Accumulated Benefit Obligations (Details) (Pension Plans, Defined Benefit [Member], USD $)
In Millions, unless otherwise specified

12 Months Ended

Dec. 31, 2012

Dec. 31, 2011

Pension Plans, Defined Benefit [Member]

Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]

Fair Value of Plan Assets at Beginning of Year

$ 441.3

$ 352.7

Actual Return on Plan Assets

38.0

25.6

Employer Contributions

83.7

Plan Participants' Contributions

0.1

Benefits Paid

(21.5)

(20.4)

Settlement Benefits

(0.2)

(0.4)

Fair Value of Plan Assets at End of Year

457.6

441.3

Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

Benefit Obligations at Beginning of Year

499.2

433.1

Service Cost

10.8

10.2

Interest Cost

22.4

22.9

Plan Participants' Contributions

0.1

Benefits Paid

(21.5)

(20.4)

Settlement Benefits

(0.2)

(0.4)

Actuarial Losses

(43.2)

(53.7)

Benefit Obligations at End Of Year

553.9

499.2

Funded Status - Benefit Obligation In Excess of Plan Assets

(96.3)

(57.9)

Amount Recognized in Accumulated Other Comprehensive Income:

Accumulated Actuarial Loss

(166.4)

(150.4)

Prior Service Cost

0.1

0.2

Amount Recognized in Accumulated Other Comprehensive Income

(166.3)

(150.2)

Accumulated Benefit Obligation

$ 531.3

$ 480.5

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For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to 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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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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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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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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

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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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The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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