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Pension and Postretirement Health and Life Benefits (Tables) | 12 Months Ended
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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 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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