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, 2014	Dec. 31, 2013
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	$ 524.5	$ 457.6
Actual Return on Plan Assets	41.7	34.5
Employer Contributions	0	55.0
Benefits Paid	(23.2)	(22.6)
Fair Value of Plan Assets at End of Year	543.0	524.5
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]
Benefit Obligations at Beginning of Year	515.5	553.9
Service Cost	8.7	10.8
Interest Cost	24.8	22.4
Benefits Paid	(23.2)	(22.6)
Plan Amendments	(0.6)	0
Actuarial Losses (Gains)	(108.8)	49.0
Projected Benefit Obligation at End of Year	634.0	515.5
Funded Status—Plan Assets in Excess (Deficit) of Projected Benefit Obligation	(91.0)	9.0
Amount Recognized in Accumulated Other Comprehensive Income:
Accumulated Actuarial Loss	(178.6)	(86.3)
Prior Service Credit	0.5	0
Unamortized Amount Reported in AOCI at End of Year	(178.1)	(86.3)
Accumulated Benefit Obligation at End of Year	$ 608.2	$ 496.2

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, 2014

Dec. 31, 2013

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

$ 524.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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$ 457.6us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Actual Return on Plan Assets

41.7us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
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= us-gaap_PensionPlansDefinedBenefitMember

34.5us-gaap_DefinedBenefitPlanActualReturnOnPlanAssets
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Employer Contributions

0us-gaap_DefinedBenefitPlanContributionsByEmployer
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55.0us-gaap_DefinedBenefitPlanContributionsByEmployer
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Benefits Paid

(23.2)us-gaap_DefinedBenefitPlanBenefitsPaid
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= us-gaap_PensionPlansDefinedBenefitMember

(22.6)us-gaap_DefinedBenefitPlanBenefitsPaid
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= us-gaap_PensionPlansDefinedBenefitMember

Fair Value of Plan Assets at End of Year

543.0us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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524.5us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
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Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]

Benefit Obligations at Beginning of Year

515.5us-gaap_DefinedBenefitPlanBenefitObligation
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= us-gaap_PensionPlansDefinedBenefitMember

553.9us-gaap_DefinedBenefitPlanBenefitObligation
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Service Cost

8.7us-gaap_DefinedBenefitPlanServiceCost
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10.8us-gaap_DefinedBenefitPlanServiceCost
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Interest Cost

24.8us-gaap_DefinedBenefitPlanInterestCost
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22.4us-gaap_DefinedBenefitPlanInterestCost
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Benefits Paid

(23.2)us-gaap_DefinedBenefitPlanBenefitsPaid
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(22.6)us-gaap_DefinedBenefitPlanBenefitsPaid
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Plan Amendments

(0.6)us-gaap_DefinedBenefitPlanPlanAmendments
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0us-gaap_DefinedBenefitPlanPlanAmendments
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Actuarial Losses (Gains)

(108.8)us-gaap_DefinedBenefitPlanActuarialGainLoss
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49.0us-gaap_DefinedBenefitPlanActuarialGainLoss
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Projected Benefit Obligation at End of Year

634.0us-gaap_DefinedBenefitPlanBenefitObligation
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515.5us-gaap_DefinedBenefitPlanBenefitObligation
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Funded Status—Plan Assets in Excess (Deficit) of Projected Benefit Obligation

(91.0)us-gaap_DefinedBenefitPlanFundedStatusOfPlan
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9.0us-gaap_DefinedBenefitPlanFundedStatusOfPlan
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Amount Recognized in Accumulated Other Comprehensive Income:

Accumulated Actuarial Loss

(178.6)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
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(86.3)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetGainsLossesBeforeTax
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Prior Service Credit

0.5us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
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0us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeNetPriorServiceCostCreditBeforeTax
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Unamortized Amount Reported in AOCI at End of Year

(178.1)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
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(86.3)us-gaap_DefinedBenefitPlanAccumulatedOtherComprehensiveIncomeBeforeTax
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= us-gaap_PensionPlansDefinedBenefitMember

Accumulated Benefit Obligation at End of Year

$ 608.2us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
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$ 496.2us-gaap_DefinedBenefitPlanAccumulatedBenefitObligation
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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.

+ References

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-Glossary Actual Return on Plan Assets (Component of Net Periodic Postretirement Benefit Cost)

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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-Glossary Gain or Loss

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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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-Glossary Projected Benefit Obligation

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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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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 amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered.

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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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