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Pension and Postretirement Health and Life Benefits (Tables) | 12 Months Ended
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Dec. 31, 2014
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
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| Three Months Ended December 31, 2014 |  |  | Nine Months Ended September 30, 2014 |  | Year Ended December 31, 2013 |  | Three Months Ended December 31, 2014 |  |  | Nine Months Ended September 30, 2014 |  | Year Ended December 31, 2013
Changes in Benefit Obligations: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations at beginning of period | $ | 965.1 |  |  |  | $ | 907.4 |  |  | $ | 1,099.0 |  |  | $ | 240.4 |  |  |  | $ | 231.9 |  |  | $ | 248.8 |
Actuarial (gains) losses, net | 18.7 |  |  |  | 96.0 |  |  | (121.0 | ) |  | 4.3 |  |  |  | 8.3 |  |  | (25.2 | )
Service costs | 2.0 |  |  |  | 1.8 |  |  | 9.9 |  |  | 0.2 |  |  |  | 1.3 |  |  | 3.6 |
Interest costs | 10.2 |  |  |  | 31.7 |  |  | 45.0 |  |  | 2.3 |  |  |  | 7.5 |  |  | 9.0 |
Benefits paid | (15.0 | ) |  |  | (44.3 | ) |  | (58.2 | ) |  | (2.8 | ) |  |  | (8.7 | ) |  | (12.2 | )
Lump sum benefits paid | (17.9 | ) |  |  | (24.7 | ) |  | (47.2 | ) |  | — |  |  |  | — |  |  | — |
Less federal subsidy on benefits paid | — |  |  |  | — |  |  | — |  |  | 0.1 |  |  |  | 0.1 |  |  | 0.5 |
Administrative expenses paid | (1.7 | ) |  |  | N/A |  |  | N/A |  |  | N/A |  |  |  | N/A |  |  | N/A |
Plan amendments | — |  |  |  | — |  |  | — |  |  | (6.8 | ) |  |  | — |  |  | (27.8 | )
Curtailments | — |  |  |  | (2.8 | ) |  | (20.1 | ) |  | — |  |  |  | — |  |  | 24.6 |
Special termination benefits | — |  |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | 10.6 |
Obligations at end of period | 961.4 |  |  |  | 965.1 |  |  | 907.4 |  |  | 237.7 |  |  |  | 240.4 |  |  | 231.9 |
Changes in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | 781.5 |  |  |  | 784.0 |  |  | 774.8 |  |  | 28.7 |  |  |  | 36.9 |  |  | 41.6 |
Actual return on plan assets | 25.5 |  |  |  | 46.2 |  |  | 92.7 |  |  | 0.7 |  |  |  | 0.5 |  |  | 6.9 |
Company contributions | — |  |  |  | 20.3 |  |  | 21.9 |  |  | (0.3 | ) |  |  | — |  |  | 0.6 |
Benefits paid | (15.0 | ) |  |  | (44.3 | ) |  | (58.2 | ) |  | (2.8 | ) |  |  | (8.7 | ) |  | (12.2 | )
Lump sum benefits paid | (17.9 | ) |  |  | (24.7 | ) |  | (47.2 | ) |  | — |  |  |  | — |  |  | — |
Administrative expenses paid | (1.7 | ) |  |  | N/A |  |  | N/A |  |  | N/A |  |  |  | N/A |  |  | N/A |
Fair value of plan assets at end of period | 772.4 |  |  |  | 781.5 |  |  | 784.0 |  |  | 26.3 |  |  |  | 28.7 |  |  | 36.9 |
(Unfunded) status at end of period | (189.0 | ) |  |  | (183.6 | ) |  | (123.4 | ) |  | (211.4 | ) |  |  | (211.7 | ) |  | (195.0 | )
Amounts recognized in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | $ | (9.7 | ) |  |  | $ | (9.5 | ) |  | $ | (2.2 | ) |  | — |  |  |  | — |  |  | — |
Noncurrent liabilities | (179.3 | ) |  |  | (174.1 | ) |  | (121.2 | ) |  | (211.4 | ) |  |  | (211.7 | ) |  | (195.0 | )
| $ | (189.0 | ) |  |  | $ | (183.6 | ) |  | $ | (123.4 | ) |  | $ | (211.4 | ) |  |  | $ | (211.7 | ) |  | $ | (195.0 | )
Amounts recognized in accumulated other comprehensive income (loss), pre-tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss | $ | — |  |  |  | $ | 202.4 |  |  | $ | 115.3 |  |  | $ | — |  |  |  | $ | 22.0 |  |  | $ | 12.8 |
Prior service cost (credit) | — |  |  |  | — |  |  | 0.2 |  |  | (6.8 | ) |  |  | (1.8 | ) |  | (2.1 | )
| $ | — |  |  |  | $ | 202.4 |  |  | $ | 115.5 |  |  | $ | (6.8 | ) |  |  | $ | 20.2 |  |  | $ | 10.7 |
Assumptions used to determine benefit obligations at end of period: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.1% |  |  | 4.3% |  | 4.9% |  | 3.8% |  |  | 4.0% |  | 4.5%
Compensation increases | n/a |  |  | n/a |  | 2.0% |  | 2.0% |  |  | 2.0% |  | 2.0%
Schedule of Net Benefit Costs |
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| Three Mos. Ended Dec. 31, 2014 |  |  | Nine Mos. Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2013 |  | Three Mos. Ended Dec. 31, 2014 |  |  | Nine Mos. Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2013
Net Periodic Benefit Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Service costs | $ | 2.0 |  |  |  | $ | 1.8 |  |  | $ | 9.9 |  |  | $ | 0.2 |  |  |  | $ | 1.3 |  |  | $ | 3.6 |
Interest costs | 10.2 |  |  |  | 31.7 |  |  | 45.0 |  |  | 2.3 |  |  |  | 7.5 |  |  | 9.0 |
Expected return on plan assets (gains) | (13.1 | ) |  |  | (38.5 | ) |  | (51.1 | ) |  | (0.4 | ) |  |  | (1.5 | ) |  | (2.3 | )
Amortization of prior service costs (credits), net |  |  |  | — |  |  | 0.7 |  |  | — |  |  |  | (0.3 | ) |  | — |
Amortization of actuarial (gains) losses, net | 6.4 |  |  |  | 1.0 |  |  | 16.2 |  |  | 4.0 |  |  |  |  |  |  | 2.7 |
Curtailment loss (gain) | — |  |  |  | (2.2 | ) |  | 12.6 |  |  | — |  |  |  | — |  |  | (1.0 | )
Special termination loss | — |  |  |  | — |  |  | — |  |  | — |  |  |  | — |  |  | 10.6 |
Net periodic benefit costs | $ | 5.5 |  |  |  | $ | (6.2 | ) |  | $ | 33.3 |  |  | $ | 6.1 |  |  |  | $ | 7.0 |  |  | $ | 22.6 |
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 | $ | 6.4 |  |  |  | $ | 85.4 |  |  | $ | (182.7 | ) |  | $ | 4.0 |  |  |  | $ | 9.2 |  |  | $ | (5.1 | )
Net prior service cost (credit) | — |  |  |  | — |  |  | — |  |  | (6.8 | ) |  |  | — |  |  | (27.8 | )
Amortization of actuarial gains (losses), net | (6.4 | ) |  |  | 1.5 |  |  | (28.0 | ) |  | (4.0 | ) |  |  | — |  |  | (27.3 | )
Amortization of prior service (costs) credits | — |  |  |  | (0.2 | ) |  | (1.5 | ) |  | — |  |  |  | 0.3 |  |  | 25.6 |
Total (gain) loss recognized in other comprehensive income (loss), pre-tax | $ | — |  |  |  | $ | 86.7 |  |  | $ | (212.2 | ) |  | $ | (6.8 | ) |  |  | $ | 9.5 |  |  | $ | (34.6 | )
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | $ | 5.5 |  |  |  | $ | 80.5 |  |  | $ | (178.9 | ) |  | $ | (0.7 | ) |  |  | $ | 16.5 |  |  | $ | 12.0 |
Schedule of Assumptions Used [Table Text Block] |
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| Three Mos. Ended Dec. 31, 2014 |  |  | Nine Mos. Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2013 |  | Three Mos. Ended Dec. 31, 2014 |  |  | Nine Mos. Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2013
Assumptions used to determine net periodic benefit costs: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.1% |  |  | 4.3% |  | 4.9% |  | 4.0% |  |  | 4.0% |  | 4.5%
Expected return on plan assets | 7.0% |  |  | 6.8% |  | 6.8% |  | 5.8% |  |  | 6.8% |  | 6.8%
Compensation increases | n/a |  |  | n/a |  | 4.0% |  | 2.0% |  |  | 2.0% |  | 4.0%
Schedule of Health Care Cost Trend Rates [Table Text Block] |
| Successor |  |  | Predecessor
| December 31, 2014 |  |  | September 30, 2014 |  | December 31, 2013
Healthcare cost trend rate for the following year | 8% |  |  | 7.5% |  | 7.5%
Long-term rate that the healthcare cost trend rate gradually declines to | 5% |  |  | 5% |  | 5%
Year that the healthcare cost trend rate is expected to reach the long-term rate | 2021 |  |  | 2019 |  | 2019
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 | $ | 5.9 |  |  | $ | (5.5 | )
Net periodic benefit costs (service and interest cost components only) | $ | 0.1 |  |  | $ | (0.1 | )
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:
| December 31, |  |
| 2014 |  | 2013 |  | 2015 Target
Defined Benefit Pension Plans: |  |  |  |  |  |  |
Equity securities | 48 | % |  | 54 | % |  | 40 | - | 60%
Debt securities | 52 |  |  | 46 |  |  | 40 | - | 60
| 100 | % |  | 100 | % |  |  |  |
Postretirement Health and Life Benefit Plans: |  |  |  |  |  |  |
Equity securities | 65 | % |  | 69 | % |  | 55 | - | 75%
Debt securities | 35 |  |  | 31 |  |  | 25 | - | 45
| 100 | % |  | 100 | % |  |  |  |
Plan assets are measured at fair value. Following are the plan investments as of December 31, 2014 and December 31, 2013 categorized by the fair value hierarchy levels described in Note 14, Fair Value Measurements, (in millions):
| Defined Benefit Pension Plans
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
U.S. government securities | $ | — |  |  | $ | — |  |  | $ | 81.5 |  |  | $ | 74.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 81.5 |  |  | $ | 74.2 |
Collective trust - money market funds | — |  |  | — |  |  | 10.6 |  |  | 19.4 |  |  | — |  |  | — |  |  | 10.6 |  |  | 19.4 |
Collective trust - bond funds | — |  |  | — |  |  | 51.8 |  |  | 48.1 |  |  | — |  |  | — |  |  | 51.8 |  |  | 48.1 |
Collective trust - equity funds | — |  |  | — |  |  | 366.7 |  |  | 423.1 |  |  | — |  |  | — |  |  | 366.7 |  |  | 423.1 |
Corporate debt | — |  |  | — |  |  | 249.6 |  |  | 208.5 |  |  | — |  |  | — |  |  | 249.6 |  |  | 208.5 |
Municipal bonds | — |  |  | — |  |  | 8.1 |  |  | 7.0 |  |  | — |  |  | — |  |  | 8.1 |  |  | 7.0 |
Fair value of investments by hierarchy level | $ | — |  |  | $ | — |  |  | $ | 768.3 |  |  | $ | 780.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 768.3 |  |  | $ | 780.3 |
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  |  | 4.0 |  |  | 4.0 |
Unsettled transactions |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  | (0.3 | )
Plan assets |  |  |  |  |  |  |  |  |  |  |  |  | $ | 772.4 |  |  | $ | 784.0 |
| Postretirement Health and Life Benefit Plans
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013 |  | 2014 |  | 2013
Money market funds | $ | — |  |  | $ | — |  |  | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 0.8 |  |  | $ | 0.9 |
Bond mutual funds | 8.5 |  |  | 10.4 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 8.5 |  |  | 10.4 |
Equity mutual funds | 17.0 |  |  | 25.6 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 17.0 |  |  | 25.6 |
Fair value of investments by hierarchy level | $ | 25.5 |  |  | $ | 36.0 |  |  | $ | 0.8 |  |  | $ | 0.9 |  |  | $ | — |  |  | $ | — |  |  | $ | 26.3 |  |  | $ | 36.9 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] |
| Year Ended December 31, 2013
Beginning balance | $ | 0.6 |
Transfer out to Level 2 | (0.6 | )
Transfer in from Level 2 | — |
New purchases | — |
Ending balance | $ | — |
Schedule of Expected Benefit Payments [Table Text Block] |
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
2015 | $ | 92.9 |  |  | $ | 18.6 |
2016 | 58.6 |  |  | 22.1 |
2017 | 56.9 |  |  | 23.9 |
2018 | 56.0 |  |  | 23.0 |
2019 | 53.4 |  |  | 21.7 |
2020 to 2024 | 253.6 |  |  | 84.0 |

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19279-110258 + Details
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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=35743120&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=35743120&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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 (h) -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e1928-114920 + Details
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