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Pension and Other Postretirement Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2013

Defined Benefit Plan Disclosure [Line Items]

Estimated Future Benefit Payments [Table Text Block]

Estimated Future Benefit Payments
	Pension			Postretirement Health and Life
Millions
2014		$33.9			$7.7
2015		$34.9			$8.4
2016		$35.8			$8.8
2017		$36.9			$9.2
2018		$37.8			$9.4
Years 2019 – 2023		$200.2			$50.6

Defined Benefit Costs Recorded in Regulatory Long-Term Assets or Liabilities and Accumulated Other Comprehensive Income Expected to be Recognized over Next Fiscal Year [Table Text Block]

The pension and postretirement health and life costs recorded in regulatory long-term assets or liabilities and accumulated other comprehensive income expected to be recognized as a component of net pension and postretirement benefit costs for the year ending December 31, 2014, are as follows:

	Pension			Postretirement Health and Life
Millions
Net Loss		$14.2			$0.5
Prior Service Cost (Credit)	0.3			(2.5		)
Total Pension and Postretirement Health and Life Cost (Credit)		$14.5		$(2.0)

Weighted-Average Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block]

Weighted-Average Assumptions Used to Determine Benefit Obligation
As of December 31	2013	2012
Discount Rate
Pension	4.93%	4.10%
Postretirement Health and Life	4.96%	4.13%
Rate of Compensation Increase	3.7 - 4.3%	4.3 - 4.6%
Health Care Trend Rates
Trend Rate	7.25%	9.25%
Ultimate Trend Rate	5%	5%
Year Ultimate Trend Rate Effective	2020	2019

Weighted-Average Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31	2013	2012	2011
Discount Rate	4.10 - 4.13%	4.54 - 4.56%	5.36 - 5.40%
Expected Long-Term Return on Plan Assets (a)
Pension	8.25%	8.25%	8.5%
Postretirement Health and Life	6.6 - 8.25%	6.6 - 8.25%	6.8 - 8.5%
Rate of Compensation Increase	4.3 - 4.6%	4.3 - 4.6%	4.3 - 4.6%

(a) The expected long-term rate of return used to determine net periodic benefit expense for 2014 has been reduced to 8.00 percent.

Plan Asset Allocations, Actual and Target [Table Text Block]

Actual Plan Asset Allocations
	Pension				Postretirement Health and Life (a)
	2013		2012		2013		2012
Equity Securities	52	%	54	%	63	%	56	%
Debt Securities	34	%	28	%	29	%	35	%
Private Equity	9	%	13	%	8	%	9	%
Real Estate	5	%	5	%	—		—
	100	%	100	%	100	%	100	%

(a) Includes VEBAs and irrevocable grantor trusts.

Plan Asset Target Allocations
	Pension		Postretirement Health and Life (a)
Equity Securities	52	%	50	%
Debt Securities	30	%	30	%
Private Equity	9	%	10	%
Real Estate	9	%	10	%
	100	%	100	%

(a) Includes VEBAs and irrevocable grantor trusts.

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of December 31, 2013
Recurring Fair Value Measures	Level 1				Level 2				Level 3			Total
Millions
Assets:
Investments
Available-for-sale Securities – Equity Securities		$7.9			—				—				$7.9
Available-for-sale Securities – Corporate Debt Securities	—					$9.8			—			9.8
Cash Equivalents	34.2				—				—			34.2
Total Fair Value of Assets		$42.1				$9.8			—				$51.9
Liabilities:
Deferred Compensation	—					$16.8			—				$16.8
Derivatives – Interest Rate Swap	—				0.6				—			0.6
Total Fair Value of Liabilities	—					$17.4			—				$17.4
Total Net Fair Value of Assets (Liabilities)		$42.1			$(7.6)				—				$34.5

	Fair Value as of December 31, 2012
Recurring Fair Value Measures	Level 1				Level 2				Level 3			Total
Millions
Assets:
Investments
Available-for-sale Securities – Equity Securities		$18.0			—				—				$18.0
Available-for-sale Securities – Corporate Debt Securities	—					$8.8			—			8.8
Cash Equivalents	20.7				—				—			20.7
Total Fair Value of Assets		$38.7				$8.8			—				$47.5
Liabilities:
Deferred Compensation	—					$14.0			—				$14.0
Derivatives – Interest Rate Swap	—				0.7				—			0.7
Total Fair Value of Liabilities	—					$14.7			—				$14.7
Total Net Fair Value of Assets (Liabilities)		$38.7			$(5.9)				—				$32.8

Pension [Member]

Defined Benefit Plan Disclosure [Line Items]

Obligation and Funded Status [Table Text Block]

Pension Obligation and Funded Status
Year Ended December 31	2013			2012
Millions
Accumulated Benefit Obligation		$577.6			$598.7
Change in Benefit Obligation
Obligation, Beginning of Year		$652.1			$597.5
Service Cost	9.9			9.1
Interest Cost	26.0			26.4
Actuarial (Gain) Loss	(49.2		)	38.5
Benefits Paid	(33.5		)	(30.9		)
Participant Contributions	17.5			11.5
Obligation, End of Year		$622.8			$652.1
Change in Plan Assets
Fair Value, Beginning of Year		$460.1			$432.4
Actual Return on Plan Assets	56.5			38.7
Employer Contribution (a)	18.5			19.9
Benefits Paid	(33.5		)	(30.9		)
Fair Value, End of Year		$501.6			$460.1
Funded Status, End of Year	$(121.2)			$(192.0)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of:
Current Liabilities	$(1.1)			$(1.1)
Non-Current Liabilities	$(120.1)			$(190.9)

(a) Includes participant contributions noted above.

Unrecognized Costs [Table Text Block]

The pension costs that are reported as a component within our Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist of the following:

Unrecognized Pension Costs
Year Ended December 31	2013			2012
Millions
Net Loss		$194.9			$286.8
Prior Service Cost	0.4			0.7
Total Unrecognized Pension Costs		$195.3			$287.5

Components of Net Periodic Expense [Table Text Block]

Components of Net Periodic Pension Expense
Year Ended December 31	2013			2012			2011
Millions
Service Cost		$9.9			$9.1			$7.6
Interest Cost	26.0			26.4			27.4
Expected Return on Plan Assets	(35.2		)	(35.4		)	(34.6		)
Amortization of Loss	21.5			17.5			12.1
Amortization of Prior Service Cost	0.3			0.3			0.3
Net Pension Expense		$22.5			$17.9			$12.8

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets [Table Text Block]

Other Changes in Pension Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets
Year Ended December 31	2013		2012
Millions
Net (Gain) Loss	$(70.4)			$35.2
Amortization of Prior Service Cost	(0.3	)	(0.3		)
Amortization of Loss	(21.5	)	(17.5		)
Total Recognized in Other Comprehensive Income and Regulatory Assets	$(92.2)			$17.4

Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block]

Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets
Year Ended December 31	2013			2012
Millions
Projected Benefit Obligation		$622.8			$652.1
Accumulated Benefit Obligation		$577.6			$598.7
Fair Value of Plan Assets		$501.6			$460.1

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of December 31, 2012
Recurring Fair Value Measures	Level 1			Level 2			Level 3			Total
Millions
Assets:
Equity Securities:
U.S. Large-cap (a)		$43.0			$36.0		—				$79.0
U.S. Mid-cap Growth (a)	18.3			15.3			—			33.6
U.S. Small-cap (a)	18.3			15.3			—			33.6
International	50.5			45.9			—			96.4
Debt Securities:
Mutual Funds	72.5			—			—			72.5
Fixed Income	10.4			50.8			—			61.2
Other Types of Investments:
Private Equity Funds	—			—				$58.9		58.9
Real Estate	—			—			24.9			24.9
Total Fair Value of Assets		$213.0			$163.3			$83.8			$460.1

(a) The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.

	Fair Value as of December 31, 2013
Recurring Fair Value Measures	Level 1			Level 2			Level 3			Total
Millions
Assets:
Equity Securities:
U.S. Large-cap (a)		$20.9			$59.3		—				$80.2
U.S. Mid-cap Growth (a)	9.4			26.7			—			36.1
U.S. Small-cap (a)	9.9			28.2			—			38.1
International	61.2			43.5			—			104.7
Debt Securities:
Mutual Funds	130.1			—			—			130.1
Fixed Income	—			36.4			—			36.4
Cash Equivalents	2.7			—			—			2.7
Other Types of Investments:
Private Equity Funds	—			—				$46.8		46.8
Real Estate	—			—			26.5			26.5
Total Fair Value of Assets		$234.2			$194.1			$73.3			$501.6

(a) The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.

Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]

Recurring Fair Value Measures
Activity in Level 3		Private Equity Funds			Real Estate
Millions
Balance as of December 31, 2011			$69.0			$21.7
Actual Return on Plan Assets		(9.7		)	3.4
Purchases, sales, and settlements, net		(0.4		)	(0.2		)
Balance as of December 31, 2012			$58.9			$24.9

Recurring Fair Value Measures
Activity in Level 3	Private Equity Funds			Real Estate
Millions
Balance as of December 31, 2012		$58.9			$24.9
Actual Return on Plan Assets	2.3			2.1
Purchases, sales, and settlements, net	(14.4		)	(0.5		)
Balance as of December 31, 2013		$46.8			$26.5

Postretirement Health and Life [Member]

Defined Benefit Plan Disclosure [Line Items]

Obligation and Funded Status [Table Text Block]

Postretirement Health and Life Obligation and Funded Status
Year Ended December 31	2013			2012
Millions
Change in Benefit Obligation
Obligation, Beginning of Year		$168.8			$210.6
Service Cost	3.9			4.2
Interest Cost	6.8			9.4
Actuarial Gain	(18.8		)	(43.2		)
Participant Contributions	2.7			2.6
Plan Amendments	—			(5.3		)
Benefits Paid	(9.9		)	(9.5		)
Settlements (a)	(1.6		)	—
Obligation, End of Year		$151.9			$168.8
Change in Plan Assets
Fair Value, Beginning of Year		$131.0			$121.0
Actual Return on Plan Assets	21.4			14.3
Employer Contribution	11.7			2.3
Participant Contributions	2.7			2.5
Benefits Paid	(9.8		)	(9.1		)
Fair Value, End of Year		$157.0			$131.0
Funded Status, End of Year	$5.1			$(37.8)
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of:
Non-Current Assets	$19.4			—
Current Liabilities	$(0.9)			$(0.8)
Non-Current Liabilities	$(13.4)			$(37.0)

(a) Result of the exit from a legacy benefit plan.

Unrecognized Costs [Table Text Block]

The postretirement health and life costs that are reported as a component within our Consolidated Balance Sheet, reflected in regulatory long-term assets or liabilities and accumulated other comprehensive income, consist of the following:

Unrecognized Postretirement Health and Life Costs
Year Ended December 31	2013		2012
Millions
Net (Gain) Loss	$(9.0)			$23.5
Prior Service Credit	(10.1	)	(13.1		)
Total Unrecognized Postretirement Health and Life Costs (Credit)	$(19.1)			$10.4

Components of Net Periodic Expense [Table Text Block]

Components of Net Periodic Postretirement Health and Life Expense
Year Ended December 31	2013			2012			2011
Millions
Service Cost		$3.9			$4.2			$3.8
Interest Cost	6.8			9.4			10.8
Expected Return on Plan Assets	(9.7		)	(9.9		)	(9.7		)
Amortization of Prior Service Credit	(2.5		)	(1.7		)	(1.7		)
Amortization of Loss	1.6			7.5			8.5
Amortization of Transition Obligation	—			0.1			0.1
Effect of Plan Settlement (a)	(1.6		)	—			—
Net Postretirement Health and Life Expense (Credit)	$(1.5)				$9.6			$11.8

(a) Result of the exit from a legacy benefit plan.

Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets [Table Text Block]

Other Changes in Postretirement Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets
Year Ended December 31	2013		2012
Millions
Net Gain	$(30.2)		$(47.5)
Prior Service Credit Arising During the Period	—		(5.3	)
Amortization of Prior Service Credit	2.5		1.7
Amortization of Transition Obligation	—		(0.1	)
Amortization of Loss	(1.6	)	(7.5	)
Amount Recognized due to Plan Settlement (a)	(0.2	)	—
Total Recognized in Other Comprehensive Income and Regulatory Assets	$(29.5)		$(58.7)

(a) Result of the exit from a legacy benefit plan.

Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates [Table Text Block]

Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates
	One Percent Increase			One Percent Decrease
Millions
Effect on Total of Postretirement Health and Life Service and Interest Cost		$1.6		$(1.3)
Effect on Postretirement Health and Life Obligation		$16.0		$(13.4)

Recurring Fair Value Measures [Table Text Block]

	Fair Value as of December 31, 2013
Recurring Fair Value Measures	Level 1			Level 2			Level 3			Total
Millions
Assets:
Equity Securities:
U.S. Large-cap (a)		$28.3		—			—				$28.3
U.S. Mid-cap Growth (a)	17.6			—			—			17.6
U.S. Small-cap (a)	18.2			—			—			18.2
International	33.4			—			—			33.4
Debt Securities:
Mutual Funds	30.8			—			—			30.8
Fixed Income	—				$15.5		—			15.5
Cash Equivalents	0.1			—			—			0.1
Other Types of Investments:
Private Equity Funds	—			—				$13.1		13.1
Total Fair Value of Assets		$128.4			$15.5			$13.1			$157.0

(a) The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

	Fair Value as of December 31, 2012
Recurring Fair Value Measures	Level 1			Level 2			Level 3			Total
Millions
Assets:
Equity Securities:
U.S. Large-cap (a)		$16.7		—			—				$16.7
U.S. Mid-cap Growth (a)	13.2			—			—			13.2
U.S. Small-cap (a)	13.3			—			—			13.3
International	30.3			—			—			30.3
Debt Securities:
Mutual Funds	25.5			—			—			25.5
Fixed Income	0.2				$18.3		—			18.5
Other Types of Investments:
Private Equity Funds	—			—				$13.5		13.5
Total Fair Value of Assets		$99.2			$18.3			$13.5			$131.0

(a) The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).

Recurring Fair Value Measures - Activity in Level 3 [Table Text Block]

Recurring Fair Value Measures
Activity in Level 3	Private Equity Funds
Millions
Balance as of December 31, 2011		$14.0
Actual Return on Plan Assets	0.2
Purchases, sales, and settlements, net	(0.7		)
Balance as of December 31, 2012		$13.5

Recurring Fair Value Measures
Activity in Level 3	Private Equity Funds
Millions
Balance as of December 31, 2012		$13.5
Actual Return on Plan Assets	2.4
Purchases, sales, and settlements, net	(2.8		)
Balance as of December 31, 2013		$13.1

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Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset.

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Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.

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Tabular disclosure of net funded status of pension plans and/or other employee benefit plans.

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-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

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