Pension and Postretirement Health and Life Benefits (Tables)

12 Months Ended

Dec. 31, 2013

General Discussion of Pension and Other Postretirement Benefits [Abstract]

Schedule of Changes in Projected Benefit Obligations [Table Text Block]

Changes in the projected benefit obligations and plan assets and the funded status of the plans follow (in millions):



	Defined Benefit Pension Plans						Postretirement Health and Life Benefit Plans
	Years Ended December 31,						Years Ended December 31,
	2013			2012			2013			2012
Changes in Benefit Obligations:
Obligations at beginning of year	$	1,099.0		$	989.5		$	248.8		$	252.9
Actuarial (gains) losses, net	(121.0		)	104.6			(25.2		)	(7.2		)
Service costs	9.9			14.6			3.6			3.7
Interest costs	45.0			48.3			9.0			11.1
Benefits paid	(58.2		)	(58.0		)	(12.2		)	(12.3		)
Lump sum benefits paid	(47.2		)	—			—			—
Less federal subsidy on benefits paid	—			—			0.5			0.6
Plan amendments	—			—			(27.8		)	—
Curtailments	(20.1		)	—			24.6			—
Special termination benefits	—			—			10.6			—
Obligations at end of year	907.4			1,099.0			231.9			248.8
Changes in Plan Assets:
Fair value of plan assets at beginning of year	774.8			727.8			41.6			45.1
Actual return on plan assets	92.7			91.3			6.9			5.8
USEC contributions	21.9			13.7			0.6			3.0
Benefits paid	(58.2		)	(58.0		)	(12.2		)	(12.3		)
Lump sum benefits paid	(47.2		)	—			—			—
Fair value of plan assets at end of year	784.0			774.8			36.9			41.6
(Unfunded) status at end of year	(123.4		)	(324.2		)	(195.0		)	(207.2		)

Amounts recognized in assets and liabilities:
Current liabilities	$	(2.2	)	$	(2.5	)	—			—
Noncurrent liabilities	(121.2		)	(321.7		)	(195.0		)	(207.2		)
	$	(123.4	)	$	(324.2	)	$	(195.0	)	$	(207.2	)
Amounts recognized in accumulated other comprehensive income (loss), pre-tax:
Net actuarial loss	$	115.3		$	326.0		$	12.8		$	45.3
Prior service cost (credit)	0.2			1.7			(2.1		)	—
	$	115.5		$	327.7		$	10.7		$	45.3



Assumptions used to determine benefit obligations at end of year:
Discount rate	4.87	%	4.07	%	4.45	%	3.66	%
Compensation increases	2.00	%	4.00	%	2.00	%	4.00	%

Schedule of Net Benefit Costs



	Defined Benefit Pension Plans									Postretirement Health and Life Benefit Plans
(in millions)	Years Ended December 31,									Years Ended December 31,
	2013			2012			2011			2013			2012			2011
Net Periodic Benefit Costs
Service costs	$	9.9		$	14.6		$	16.2		$	3.6		$	3.7		$	4.3
Interest costs	45.0			48.3			50.3			9.0			11.1			12.2
Expected return on plan assets (gains)	(51.1		)	(52.0		)	(54.0		)	(2.3		)	(2.9		)	(3.7		)
Amortization of prior service costs (credits), net	0.7			1.5			1.7			—			—			—
Amortization of actuarial (gains) losses, net	16.2			19.7			9.4			2.7			4.5			2.6
Curtailment loss (gain)	12.6			—			3.2			(1.0		)	—			1.9
Special termination loss	—			—			—			10.6			—			—
Net periodic benefit costs	$	33.3		$	32.1		$	26.8		$	22.6		$	16.4		$	17.3

Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block]



Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss)
Net valuation (gain) loss	$	(182.7	)	$	65.2		$	115.4		$	(5.1	)	$	(10.1	)	$	20.8
Net prior service cost (credit)	—			—			—			(27.8		)	—			—
Amortization of actuarial gains (losses), net	(28.0		)	(19.7		)	(11.6		)	(27.3		)	(4.5		)	(4.6		)
Amortization of prior service (costs) credits	(1.5		)	(1.5		)	(1.6		)	25.6			—			—
Total (gain) loss recognized in other comprehensive income (loss), pre-tax	$	(212.2	)	$	44.0		$	102.2		$	(34.6	)	$	(14.6	)	$	16.2
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax	$	(178.9	)	$	76.1		$	129.0		$	12.0		$	1.8		$	33.5

Schedule of Assumptions Used [Table Text Block]



	Defined Benefit Pension Plans						Postretirement Health and Life Benefit Plans
	Years Ended December 31,						Years Ended December 31,
	2013		2012		2011		2013		2012		2011
Assumptions used to determine net periodic benefit costs:
Discount rates:
Final remeasurement/Curtailment	4.87	%	4.95	%	5.77	%	4.45	%	4.46	%	5.32	%
Initial Curtailment- Freeze	4.92		—		—		—		—		—
Expected return on plan assets	6.75		7.25		7.50		6.75		7.25		7.50
Compensation increases	4.00		4.25		4.25		4.00		4.25		4.25

Schedule of Health Care Cost Trend Rates [Table Text Block]



	December 31,
	2013	2012
Healthcare cost trend rate for the following year	7.5%	7.5%
Long-term rate that the healthcare cost trend rate gradually declines to	5%	5%
Year that the healthcare cost trend rate is expected to reach the long-term rate	2019	2018

Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]



	One Percentage Point
	Increase		Decrease
Postretirement health benefit obligation	$	6.3	$	(5.9	)
Net periodic benefit costs	$	0.7	$	(0.6	)

Schedule of Allocation of Plan Assets [Table Text Block]

The allocation of plan assets between equity and debt securities and the target allocation range by asset category follows:



	Percentage of Plan Assets				Target Allocation
	December 31,				Range
	2013		2012		2014
Defined Benefit Pension Plans:
Equity securities	54	%	52	%	40	-	60%
Debt securities	46		48		40	-	60
	100	%	100	%
Postretirement Health and Life Benefit Plans:
Equity securities	69	%	65	%	55	-	75%
Debt securities	31		35		25	-	45
	100	%	100	%

Plan assets are measured at fair value. Following are the plan investments as of December 31, 2013 and December 31, 2012 categorized by the fair value hierarchy levels described in Note 13 (in millions):



	Defined Benefit Pension Plans
	Level 1				Level 2				Level 3				Total
	2013		2012		2013		2012		2013		2012		2013			2012
U.S. government securities	$	—	$	—	$	74.2	$	89.8	$	—	$	—	$	74.2		$	89.8
Collective trust - money market funds	—		—		19.4		16.5		—		—		19.4			16.5
Collective trust - bond funds	—		—		48.1		47.7		—		—		48.1			47.7
Collective trust - equity funds	—		—		423.1		397.4		—		—		423.1			397.4
Corporate debt	—		—		208.5		211.1		—		0.6		208.5			211.7
Municipal bonds	—		—		7.0		7.8		—		—		7.0			7.8
Mortgage and asset backed securities	—		—		—		0.2		—		—		—			0.2
Fair value of investments by hierarchy level	$	—	$	—	$	780.3	$	770.5	$	—	$	0.6	$	780.3		$	771.1
Accrued interest receivable													4.0			3.8
Unsettled transactions payable													(0.3		)	(0.1		)
Plan assets													$	784.0		$	774.8



	Postretirement Health and Life Benefit Plans
	Level 1				Level 2				Level 3				Total
	2013		2012		2013		2012		2013		2012		2013		2012
Money market funds	$	—	$	—	$	0.9	$	0.8	$	—	$	—	$	0.9	$	0.8
Bond mutual funds	10.4		13.7		—		—		—		—		10.4		13.7
Equity mutual funds	25.6		27.1		—		—		—		—		25.6		27.1
Fair value of investments by hierarchy level	$	36.0	$	40.8	$	0.9	$	0.8	$	—	$	—	$	36.9	$	41.6

Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]



	December 31,
	2013			2012
Beginning balance	$	0.6		$	0.9
Transfer out to Level 2	(0.6		)	(0.9		)
Transfer in from Level 2	—			0.1
New purchases	—			0.5
Ending balance	$	—		$	0.6

Schedule of Expected Benefit Payments [Table Text Block]



	Defined Benefit Pension Plans		Postretirement Health and Life Benefit Plans		Expected Subsidies From Medicare
2014	$	85.8	$	16.3	$	0.2
2015	64.1		20.9		0.2
2016	73.0		24.1		0.2
2017	62.2		24.6		0.3
2018	61.4		23.9		0.3
2019 to 2023	291.5		98.2		2.0