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Employee Benefits (Tables) | 12 Months Ended
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Dec. 31, 2016
Compensation and Retirement Disclosure [Abstract] |
Reconciliation of the changes in the plans' benefit obligations and fair value of assets | The following tables provide a reconciliation of the changes in our plans' benefit obligations and fair value of assets:
|  | Pension Costs |  | OPEB Costs
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Change in benefit obligation |  |  |  |  |  |  |  |
Obligation at January 1 |  | $ | 3,083.0 |  |  | $ | 1,505.5 |  |  | $ | 842.0 |  |  | $ | 397.7 |
Obligation assumed from acquisition |  | — |  |  | 1,594.0 |  |  | — |  |  | 493.0 |
Service cost |  | 45.4 |  |  | 30.4 |  |  | 26.1 |  |  | 20.7 |
Interest cost |  | 130.8 |  |  | 94.3 |  |  | 37.0 |  |  | 26.7 |
Participant contributions |  | — |  |  | — |  |  | 16.4 |  |  | 12.7 |
Plan amendments |  | (3.0 | ) |  | — |  |  | (18.9 | ) |  | — |
Actuarial loss (gain) |  | 71.7 |  |  | 14.6 |  |  | (36.5 | ) |  | (74.0 | )
Benefit payments |  | (269.1 | ) |  | (156.0 | ) |  | (49.1 | ) |  | (36.2 | )
Federal subsidy on benefits paid |  | N/A |  |  | N/A |  |  | 1.4 |  |  | 1.6 |
Plan curtailment |  | — |  |  | 0.2 |  |  | — |  |  | (0.2 | )
Obligation at December 31 |  | $ | 3,058.8 |  |  | $ | 3,083.0 |  |  | $ | 818.4 |  |  | $ | 842.0 |
Change in fair value of plan assets |  |  |  |  |  |  |  |
Fair value at January 1 |  | $ | 2,755.1 |  |  | $ | 1,444.6 |  |  | $ | 749.8 |  |  | $ | 333.5 |
Assets received from acquisition |  | — |  |  | 1,420.9 |  |  | — |  |  | 442.1 |
Actual return on plan assets |  | 199.4 |  |  | (62.1 | ) |  | 51.5 |  |  | (15.6 | )
Employer contributions |  | 23.8 |  |  | 107.7 |  |  | 4.9 |  |  | 13.3 |
Participant contributions |  | — |  |  | — |  |  | 16.4 |  |  | 12.7 |
Benefit payments |  | (269.1 | ) |  | (156.0 | ) |  | (49.1 | ) |  | (36.2 | )
Fair value at December 31 |  | $ | 2,709.2 |  |  | $ | 2,755.1 |  |  | $ | 773.5 |  |  | $ | 749.8 |
Funded status at December 31 |  | $ | (349.6 | ) |  | $ | (327.9 | ) |  | $ | (44.9 | ) |  | $ | (92.2 | )
Amounts recognized on the balance sheets at December 31 related to the funded status of the benefit plans | The amounts recognized on our balance sheets at December 31 related to the funded status of the benefit plans were as follows:
|  | Pension Costs |  | OPEB Costs
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Other long-term assets |  | $ | 74.4 |  |  | $ | 74.1 |  |  | $ | 29.7 |  |  | $ | 50.1 |
Pension and OPEB obligations * |  | 424.0 |  |  | 402.0 |  |  | 74.6 |  |  | 142.3 |
Total net liabilities |  | $ | (349.6 | ) |  | $ | (327.9 | ) |  | $ | (44.9 | ) |  | $ | (92.2 | )
* | Includes $0.8 million of pension and $0.4 million of OPEB obligations classified as liabilities held for sale as of December 31, 2015. These amounts are included in other current liabilities on our balance sheets.
Information for pension plans with an accumulated benefit obligation in excess of plan assets | The following table shows information for pension plans with an accumulated benefit obligation in excess of plan assets. Amounts presented are as of December 31:
(in millions) |  | 2016 |  | 2015
Projected benefit obligation |  | $ | 1,667.0 |  |  | $ | 1,706.6 |
Accumulated benefit obligation |  | 1,549.5 |  |  | 1,560.5 |
Fair value of plan assets |  | 1,242.9 |  |  | 1,304.6 |
Amounts that had not yet been recognized in the entity's net periodic benefit cost | The following table shows the amounts that have not yet been recognized in our net periodic benefit cost as of December 31:
|  | Pension Costs |  | OPEB Costs
(in millions) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Accumulated other comprehensive loss (pre-tax) (1) |  |  |  |  |  |  |  |
Net actuarial loss (gain) |  | $ | 12.0 |  |  | $ | 11.4 |  |  | $ | (1.0 | ) |  | $ | (0.6 | )
Total |  | $ | 12.0 |  |  | $ | 11.4 |  |  | $ | (1.0 | ) |  | $ | (0.6 | )
Net regulatory assets (2) |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | 1,240.7 |  |  | $ | 798.1 |  |  | $ | 25.8 |  |  | $ | 23.7 |
Prior service costs (credits) |  | 10.5 |  |  | 4.7 |  |  | (87.9 | ) |  | (3.3 | )
Total |  | $ | 1,251.2 |  |  | $ | 802.8 |  |  | $ | (62.1 | ) |  | $ | 20.4 |
(1) | Amounts related to the nonregulated entities are included in accumulated other comprehensive loss.
(2) | Amounts related to the utilities and WBS are recorded as net regulatory assets or liabilities.
Estimated amounts that will be amortized into net periodic benefit cost | The following table shows the estimated amounts that will be amortized into net periodic benefit cost during 2017:
(in millions) |  | Pension Costs |  | OPEB Costs
Net actuarial loss |  | $ | 87.2 |  |  | $ | 5.8 |
Prior service costs (credits) |  | 3.0 |  |  | (11.2 | )
Total 2017 – estimated amortization |  | $ | 90.2 |  |  | $ | (5.4 | )
Schedule of the components of net periodic benefit cost | The components of net periodic benefit cost (including amounts capitalized to our balance sheets) for the years ended December 31 were as follows:
|  | Pension Costs |  | OPEB Costs
(in millions) |  | 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Service cost |  | $ | 45.4 |  |  | $ | 30.4 |  |  | $ | 10.1 |  |  | $ | 26.1 |  |  | $ | 20.7 |  |  | $ | 8.5 |
Interest cost |  | 130.8 |  |  | 94.3 |  |  | 68.1 |  |  | 37.0 |  |  | 26.7 |  |  | 17.8 |
Expected return on plan assets |  | (195.9 | ) |  | (155.6 | ) |  | (98.6 | ) |  | (52.7 | ) |  | (39.6 | ) |  | (23.7 | )
Plan settlement |  | 16.5 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Plan curtailment |  | — |  |  | (0.3 | ) |  | — |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost (credit) |  | 3.4 |  |  | 2.2 |  |  | 2.1 |  |  | (9.4 | ) |  | (6.4 | ) |  | (1.8 | )
Amortization of net actuarial loss |  | 82.9 |  |  | 68.5 |  |  | 36.7 |  |  | 8.5 |  |  | 3.9 |  |  | 1.2 |
Net periodic benefit cost |  | $ | 83.1 |  |  | $ | 39.5 |  |  | $ | 18.4 |  |  | $ | 9.5 |  |  | $ | 5.3 |  |  | $ | 2.0 |
Weighted-average assumptions used to determine benefit obligations and net periodic benefit cost for the plans | The weighted-average assumptions used to determine the benefit obligations for the plans were as follows for the years ended December 31:
|  | Pension |  | OPEB
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Discount rate |  | 4.16% |  | 4.46% |  | 4.14% |  | 4.38%
Rate of compensation increase |  | 3.60% |  | 4.00% |  | N/A |  | N/A
Assumed medical cost trend rate |  | N/A |  | N/A |  | 7.00% |  | 7.50%
Ultimate trend rate |  | N/A |  | N/A |  | 5.00% |  | 5.00%
Year ultimate trend rate is reached |  | N/A |  | N/A |  | 2021 |  | 2021
The weighted-average assumptions used to determine the net periodic benefit cost for the plans were as follows for the years ended December 31:
|  | Pension Costs
|  | 2016 |  | 2015 |  | 2014
Discount rate |  | 4.35% |  | 4.11% |  | 5.00%
Expected return on plan assets |  | 7.12% |  | 7.37% |  | 7.25%
Rate of compensation increase |  | 3.75% |  | 4.00% |  | 4.00%
|  | OPEB Costs
|  | 2016 |  | 2015 |  | 2014
Discount rate |  | 4.38% |  | 4.09% |  | 4.95%
Expected return on plan assets |  | 7.25% |  | 7.54% |  | 7.50%
Assumed medical cost trend rate (Pre 65/Post 65) |  | 7.50% |  | 7.50% |  | 7.50%
Ultimate trend rate |  | 5.00% |  | 5.00% |  | 5.00%
Year ultimate trend rate is reached |  | 2021 |  | 2021 |  | 2021
Effects of a one-percentage-point change in assumed health care cost trend rates | For the year ended December 31, 2016, a one-percentage-point change in assumed health care cost trend rates would have had the following effects:
(in millions) |  | 1% Increase |  | 1% Decrease
Effect on total of service and interest cost components of net periodic postretirement health care benefit cost |  | $ | 8.5 |  |  | $ | (6.9 | )
Effect on health care component of the accumulated postretirement benefit obligations |  | 49.6 |  |  | (39.5 | )
Investments recorded at fair value, by asset class | The following tables provide the fair values of our investments by asset class:
|  | December 31, 2016
|  | Pension Plan Assets |  | OPEB Assets
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Asset Class |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 3.7 |  |  | $ | 58.0 |  |  | $ | — |  |  | $ | 61.7 |  |  | $ | 28.8 |  |  | $ | 3.4 |  |  | $ | — |  |  | $ | 32.2 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Equity |  | 273.9 |  |  | 0.1 |  |  | — |  |  | 274.0 |  |  | 34.3 |  |  | — |  |  | — |  |  | 34.3 |
International Equity |  | 54.1 |  |  | 0.6 |  |  | — |  |  | 54.7 |  |  | 3.5 |  |  | 0.2 |  |  | — |  |  | 3.7 |
Fixed income securities: * |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Bonds |  | — |  |  | 861.3 |  |  | 0.8 |  |  | 862.1 |  |  | — |  |  | 137.9 |  |  | — |  |  | 137.9 |
International Bonds |  | — |  |  | 75.9 |  |  | — |  |  | 75.9 |  |  | — |  |  | 8.8 |  |  | — |  |  | 8.8 |
Private Equity and Real Estate |  | — |  |  | — |  |  | 14.6 |  |  | 14.6 |  |  | — |  |  | — |  |  | 1.3 |  |  | 1.3 |
|  | $ | 331.7 |  |  | $ | 995.9 |  |  | $ | 15.4 |  |  | $ | 1,343.0 |  |  | $ | 66.6 |  |  | $ | 150.3 |  |  | $ | 1.3 |  |  | $ | 218.2 |
Investments measured at net asset value |  |  |  |  |  |  |  | $ | 1,366.2 |  |  |  |  |  |  |  |  | $ | 555.3 |
Total |  | $ | 331.7 |  |  | $ | 995.9 |  |  | $ | 15.4 |  |  | $ | 2,709.2 |  |  | $ | 66.6 |  |  | $ | 150.3 |  |  | $ | 1.3 |  |  | $ | 773.5 |
* | This category represents investment grade bonds of United States and foreign issuers denominated in United States dollars from diverse industries.
|  | December 31, 2015
|  | Pension Plan Assets |  | OPEB Assets
(in millions) |  | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Level 1 |  | Level 2 |  | Level 3 |  | Total
Asset Class |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ | 17.0 |  |  | $ | 29.6 |  |  | $ | — |  |  | $ | 46.6 |  |  | $ | 10.5 |  |  | $ | 1.0 |  |  | $ | — |  |  | $ | 11.5 |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Equity |  | 132.6 |  |  | 3.4 |  |  | — |  |  | 136.0 |  |  | 24.6 |  |  | 0.1 |  |  | — |  |  | 24.7 |
International Equity |  | 103.9 |  |  | — |  |  | — |  |  | 103.9 |  |  | 21.4 |  |  | — |  |  | — |  |  | 21.4 |
Fixed income securities: * |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
United States Bonds |  | 11.4 |  |  | 797.3 |  |  | — |  |  | 808.7 |  |  | 0.3 |  |  | 122.0 |  |  | — |  |  | 122.3 |
International Bonds |  | — |  |  | 80.3 |  |  | — |  |  | 80.3 |  |  | — |  |  | 8.1 |  |  | — |  |  | 8.1 |
Private Equity and Real Estate |  | — |  |  | — |  |  | 5.5 |  |  | 5.5 |  |  | — |  |  | — |  |  | 0.4 |  |  | 0.4 |
|  | $ | 264.9 |  |  | $ | 910.6 |  |  | $ | 5.5 |  |  | $ | 1,181.0 |  |  | $ | 56.8 |  |  | $ | 131.2 |  |  | $ | 0.4 |  |  | $ | 188.4 |
Investments measured at net asset value |  |  |  |  |  |  |  | $ | 1,574.1 |  |  |  |  |  |  |  |  | $ | 561.4 |
Total |  | $ | 264.9 |  |  | $ | 910.6 |  |  | $ | 5.5 |  |  | $ | 2,755.1 |  |  | $ | 56.8 |  |  | $ | 131.2 |  |  | $ | 0.4 |  |  | $ | 749.8 |
* | This category represents investment grade bonds of United States and foreign issuers denominated in United States dollars from diverse industries.
Reconciliation of changes in the fair value of pension assets categorized as Level 3 measurements | The following tables set forth a reconciliation of changes in the fair value of pension and OPEB plan assets categorized as Level 3 in the fair value hierarchy:
|  | Private Equity and Real Estate |  | United States Bonds
(in millions) |  | Pension |  | OPEB |  | Pension
Beginning balance at January 1, 2016 |  | $ | 5.5 |  |  | $ | 0.4 |  |  | $ | — |
Realized and unrealized gains |  | 0.5 |  |  | 0.1 |  |  | — |
Purchases |  | 8.6 |  |  | 0.8 |  |  | 0.8 |
Ending balance at December 31, 2016 |  | $ | 14.6 |  |  | $ | 1.3 |  |  | $ | 0.8 |
|  | Private Equity and Real Estate
(in millions) |  | Pension |  | OPEB
Beginning balance at January 1, 2015 |  | $ | — |  |  | $ | — |
Purchases |  | 5.5 |  |  | 0.4 |
Ending balance at December 31, 2015 |  | $ | 5.5 |  |  | $ | 0.4 |
Schedule of expected future benefit payments | The following table shows the payments, reflecting expected future service, that we expect to make for pension and OPEB:
(in millions) |  | Pension Costs |  | OPEB Costs
2017 |  | $ | 215.7 |  |  | $ | 41.8 |
2018 |  | 217.1 |  |  | 49.6 |
2019 |  | 226.5 |  |  | 49.0 |
2020 |  | 233.1 |  |  | 50.9 |
2021 |  | 230.0 |  |  | 53.1 |
2022-2026 |  | 1,031.5 |  |  | 278.5 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + Details
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