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Pension and Postretirement Health and Life Benefits (Tables) | 12 Months Ended
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Dec. 31, 2015
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
| Year Ended December 31, 2015 |  | Three Months Ended December 31, 2014 |  |  | Nine Months Ended September 30, 2014 |  | Year Ended December 31, 2015 |  | Three Months Ended December 31, 2014 |  |  | Nine Months Ended September 30, 2014
Changes in Benefit Obligations: |  |  |  |  |  |  |  |  |  |  |  |  |
Obligations at beginning of period | $ | 961.4 |  |  | $ | 965.1 |  |  |  | $ | 907.4 |  |  | $ | 237.7 |  |  | $ | 240.4 |  |  |  | $ | 231.9 |
Actuarial (gains) losses, net | (55.2 | ) |  | 18.7 |  |  |  | 96.0 |  |  | (30.2 | ) |  | 4.3 |  |  |  | 8.3 |
Service costs | 5.8 |  |  | 2.0 |  |  |  | 1.8 |  |  | 0.2 |  |  | 0.2 |  |  |  | 1.3 |
Interest costs | 36.9 |  |  | 10.2 |  |  |  | 31.7 |  |  | 8.8 |  |  | 2.3 |  |  |  | 7.5 |
Benefits paid | (62.1 | ) |  | (15.0 | ) |  |  | (44.3 | ) |  | (13.1 | ) |  | (2.8 | ) |  |  | (8.7 | )
Lump sum benefits paid | (50.6 | ) |  | (17.9 | ) |  |  | (24.7 | ) |  | — |  |  | — |  |  |  | — |
Less federal subsidy on benefits paid | — |  |  | — |  |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  |  | 0.1 |
Administrative expenses paid | (3.4 | ) |  | (1.7 | ) |  |  | N/A |  |  | — |  |  | N/A |  |  |  | N/A |
Plan amendments | — |  |  | — |  |  |  | — |  |  | — |  |  | (6.8 | ) |  |  | — |
Curtailments | — |  |  | — |  |  |  | (2.8 | ) |  | — |  |  | — |  |  |  | — |
Obligations at end of period | 832.8 |  |  | 961.4 |  |  |  | 965.1 |  |  | 203.5 |  |  | 237.7 |  |  |  | 240.4 |
Changes in Plan Assets: |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of period | 772.4 |  |  | 781.5 |  |  |  | 784.0 |  |  | 26.3 |  |  | 28.7 |  |  |  | 36.9 |
Actual return on plan assets | (8.0 | ) |  | 25.5 |  |  |  | 46.2 |  |  | 0.4 |  |  | 0.7 |  |  |  | 0.5 |
Company contributions | 8.0 |  |  | — |  |  |  | 20.3 |  |  | 0.2 |  |  | (0.3 | ) |  |  | — |
Benefits paid | (62.1 | ) |  | (15.0 | ) |  |  | (44.3 | ) |  | (13.1 | ) |  | (2.8 | ) |  |  | (8.7 | )
Lump sum benefits paid | (50.6 | ) |  | (17.9 | ) |  |  | (24.7 | ) |  | — |  |  | — |  |  |  | — |
Administrative expenses paid | (3.4 | ) |  | (1.7 | ) |  |  | N/A |  |  | N/A |  |  | N/A |  |  |  | N/A |
Fair value of plan assets at end of period | 656.3 |  |  | 772.4 |  |  |  | 781.5 |  |  | 13.8 |  |  | 26.3 |  |  |  | 28.7 |
(Unfunded) status at end of period | (176.5 | ) |  | (189.0 | ) |  |  | (183.6 | ) |  | (189.7 | ) |  | (211.4 | ) |  |  | (211.7 | )
Amounts recognized in assets and liabilities: |  |  |  |  |  |  |  |  |  |  |  |  |
Current liabilities | $ | (4.2 | ) |  | $ | (9.7 | ) |  |  | $ | (9.5 | ) |  | (5.4 | ) |  | — |  |  |  | — |
Noncurrent liabilities | (172.3 | ) |  | (179.3 | ) |  |  | (174.1 | ) |  | (184.3 | ) |  | (211.4 | ) |  |  | (211.7 | )
| $ | (176.5 | ) |  | $ | (189.0 | ) |  |  | $ | (183.6 | ) |  | $ | (189.7 | ) |  | $ | (211.4 | ) |  |  | $ | (211.7 | )
Amounts recognized in accumulated other comprehensive income (loss), pre-tax: |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss | $ | — |  |  | $ | — |  |  |  | $ | 202.4 |  |  | $ | — |  |  | $ | — |  |  |  | $ | 22.0 |
Prior service cost (credit) | — |  |  | — |  |  |  | — |  |  | (0.3 | ) |  | (6.8 | ) |  |  | (1.8 | )
| $ | — |  |  | $ | — |  |  |  | $ | 202.4 |  |  | $ | (0.3 | ) |  | $ | (6.8 | ) |  |  | $ | 20.2 |
Assumptions used to determine benefit obligations at end of period: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.5% |  | 4.1% |  |  | 4.3% |  | 4.2% |  | 3.8% |  |  | 4.0%
Compensation increases | n/a |  | n/a |  |  | n/a |  | n/a |  | 2.0% |  |  | 2.0%
Schedule of Net Benefit Costs [Table Text Block] | Components of Net Periodic Benefit Costs and Other Amounts Recognized in Other Comprehensive Income (Loss) (in millions)
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| Year Ended Dec. 31, 2015 |  | Three Months Ended Dec. 31, 2014 |  |  | Nine Months Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2015 |  | Three Months Ended Dec. 31, 2014 |  |  | Nine Months Ended Sep. 30, 2014
Net Periodic Benefit Costs |  |  |  |  |  |  |  |  |  |  |  |  |
Service costs | $ | 5.8 |  |  | $ | 2.0 |  |  |  | $ | 1.8 |  |  | $ | 0.2 |  |  | $ | 0.2 |  |  |  | $ | 1.3 |
Interest costs | 36.9 |  |  | 10.2 |  |  |  | 31.7 |  |  | 8.8 |  |  | 2.3 |  |  |  | 7.5 |
Expected return on plan assets (gains) | (47.4 | ) |  | (13.1 | ) |  |  | (38.5 | ) |  | (0.8 | ) |  | (0.4 | ) |  |  | (1.5 | )
Amortization of prior service costs (credits), net | — |  |  | — |  |  |  | — |  |  | (0.3 | ) |  | — |  |  |  | (0.3 | )
Amortization of actuarial (gains) losses, net | 0.2 |  |  | 6.4 |  |  |  | 1.0 |  |  | (29.8 | ) |  | 4.0 |  |  |  |
Curtailment loss (gain) | — |  |  | — |  |  |  | (2.2 | ) |  | — |  |  | — |  |  |  | — |
Net periodic benefit costs | $ | (4.5 | ) |  | $ | 5.5 |  |  |  | $ | (6.2 | ) |  | $ | (21.9 | ) |  | $ | 6.1 |  |  |  | $ | 7.0 |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |  |  |
Net valuation (gain) loss | $ | 0.2 |  |  | $ | 6.4 |  |  |  | $ | 85.4 |  |  | $ | (29.8 | ) |  | $ | 4.0 |  |  |  | $ | 9.2 |
Net prior service cost (credit) | — |  |  | — |  |  |  | — |  |  | — |  |  | (6.8 | ) |  |  | — |
Amortization of actuarial gains (losses), net | (0.2 | ) |  | (6.4 | ) |  |  | 1.5 |  |  | 29.8 |  |  | (4.0 | ) |  |  | — |
Amortization of prior service (costs) credits | — |  |  | — |  |  |  | (0.2 | ) |  | 0.3 |  |  | — |  |  |  | 0.3 |
Total (gain) loss recognized in other comprehensive income (loss), pre-tax | $ | — |  |  | $ | — |  |  |  | $ | 86.7 |  |  | $ | 0.3 |  |  | $ | (6.8 | ) |  |  | $ | 9.5 |
Total recognized in net periodic benefit costs (income) and other comprehensive income (loss), pre-tax | $ | (4.5 | ) |  | $ | 5.5 |  |  |  | $ | 80.5 |  |  | $ | (21.6 | ) |  | $ | (0.7 | ) |  |  | $ | 16.5 |
Schedule of Assumptions Used [Table Text Block] |
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
| Successor |  |  | Predecessor |  | Successor |  |  | Predecessor
| Year Ended Dec. 31, 2015 |  | Three Months Ended Dec. 31, 2014 |  |  | Nine Months Ended Sep. 30, 2014 |  | Year Ended Dec. 31, 2015 |  | Three Months Ended Dec. 31, 2014 |  |  | Nine Months Ended Sep. 30, 2014
Assumptions used to determine net periodic benefit costs: |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate | 4.5% |  | 4.1% |  |  | 4.3% |  | 4.2% |  | 4.0% |  |  | 4.0%
Expected return on plan assets | 6.8% |  | 7.0% |  |  | 6.8% |  | 5.3% |  | 5.8% |  |  | 6.8%
Compensation increases | n/a |  | n/a |  |  | n/a |  | 2.0% |  | 2.0% |  |  | 2.0%
Schedule of Health Care Cost Trend Rates [Table Text Block] | Healthcare cost trend rates used to measure postretirement health benefit obligations follow:
| December 31,
| 2015 |  | 2014
Healthcare cost trend rate for the following year | 7.5% |  | 8%
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 | 2021 |  | 2021
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | A one-percentage-point change in the assumed healthcare cost trend rates would have an effect on the postretirement health benefit obligation and costs of the Successor Company, as follows (in millions):
| One Percentage Point
| Increase |  | Decrease
Postretirement health benefit obligation | $ | 5.2 |  |  | $ | (4.9 | )
Net periodic benefit costs (service and interest cost components only) | $ | 0.3 |  |  | $ | (0.3 | )
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, |  |
| 2015 |  | 2014 |  | 2016 Target
Defined Benefit Pension Plans: |  |  |  |  |  |  |
Equity securities | 47 | % |  | 48 | % |  | 40 | - | 60%
Debt securities | 53 |  |  | 52 |  |  | 40 | - | 60
| 100 | % |  | 100 | % |  |  |  |
Postretirement Health and Life Benefit Plans: |  |  |  |  |  |  |
Equity securities | 64 | % |  | 65 | % |  | 55 | - | 75%
Debt securities | 36 |  |  | 35 |  |  | 25 | - | 45
| 100 | % |  | 100 | % |  |  |  |
Plan assets are measured at fair value. Following are the plan investments as of December 31, 2015 and December 31, 2014 categorized by the fair value hierarchy levels described in Note 11, Fair Value Measurements, (in millions):
| Defined Benefit Pension Plans
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
U.S. government securities | $ | — |  |  | $ | — |  |  | $ | 61.8 |  |  | $ | 81.5 |  |  | $ | — |  |  | $ | — |  |  | $ | 61.8 |  |  | $ | 81.5 |
Corporate debt | — |  |  | — |  |  | 206.9 |  |  | 249.6 |  |  | — |  |  | — |  |  | 206.9 |  |  | 249.6 |
Municipal bonds | — |  |  | — |  |  | 6.8 |  |  | 8.1 |  |  | — |  |  | — |  |  | 6.8 |  |  | 8.1 |
Fair value of investments by hierarchy level | $ | — |  |  | $ | — |  |  | $ | 275.5 |  |  | $ | 339.2 |  |  | $ | — |  |  | $ | — |  |  | $ | 275.5 |  |  | $ | 339.2 |
Investments measured at NAV (a) |  |  |  |  |  |  |  |  |  |  |  |  | 377.2 |  |  | 429.1 |
Accrued interest receivable |  |  |  |  |  |  |  |  |  |  |  |  | 3.5 |  |  | 4.0 |
Unsettled transactions |  |  |  |  |  |  |  |  |  |  |  |  | 0.1 |  |  | 0.1 |
Plan assets |  |  |  |  |  |  |  |  |  |  |  |  | $ | 656.3 |  |  | $ | 772.4 |
| Postretirement Health and Life Benefit Plans
| Level 1 |  | Level 2 |  | Level 3 |  | Total
| 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Money market funds | $ | 1.0 |  |  | $ | 0.8 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1.0 |  |  | $ | 0.8 |
Bond mutual funds | 4.0 |  |  | 8.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 4.0 |  |  | 8.5 |
Equity mutual funds | 8.8 |  |  | 17.0 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 8.8 |  |  | 17.0 |
Fair value of investments by hierarchy level | $ | 13.8 |  |  | $ | 26.3 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 13.8 |  |  | $ | 26.3 |
(a) Equity, bond and money market investments held in collective trusts are valued based on the net asset value (“NAV”) provided by the administrator of the funds. The NAV for each fund is based on the underlying assets owned by the fund, less any expenses accrued against the fund, divided by the number of fund shares outstanding. While the underlying investments are traded on an exchange, the funds are not. Fair values for the collective trust investments are measured using the NAVs as a practical expedient and are not categorized in the fair value hierarchy.
Schedule of Expected Benefit Payments [Table Text Block] | Estimated future benefit plan payments follow (in millions):
| Defined Benefit Pension Plans |  | Postretirement Health and Life Benefit Plans
2016 | $ | 65.8 |  |  | $ | 19.2 |
2017 | 60.5 |  |  | 20.0 |
2018 | 59.8 |  |  | 21.0 |
2019 | 57.4 |  |  | 19.8 |
2020 | 57.5 |  |  | 18.3 |
2021 to 2025 | 266.6 |  |  | 70.5 |

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