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Pension and Other Postretirement Benefit Plans (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2015
Defined Benefit Plan Disclosure [Line Items] |
Estimated Future Benefit Payments [Table Text Block] |
Estimated Future Benefit Payments | Pension | Postretirement Health and Life
Millions |  |  |
2016 |  | $39.8 |  |  | $8.3 |
2017 |  | $40.6 |  |  | $8.6 |
2018 |  | $41.1 |  |  | $8.8 |
2019 |  | $41.7 |  |  | $9.1 |
2020 |  | $41.8 |  |  | $9.3 |
Years 2021 – 2025 |  | $216.2 |  |  | $48.0 |
Defined Benefit Costs Recorded in Regulatory Long-Term Assets or Liabilities and Accumulated Other Comprehensive Income Expected to be Recognized over Next Fiscal Year [Table Text Block] | The pension and postretirement health and life costs recorded in regulatory long-term assets or liabilities and accumulated other comprehensive income expected to be recognized as a component of net pension and postretirement benefit costs for the year ending December 31, 2016, are as follows:
| Pension | Postretirement Health and Life
Millions |  |
Net (Gain) Loss | $(8.4) | $0.2
Prior Service Credit | — |  | (2.9)
Total Pension and Postretirement Health and Life Credit | $(8.4) | $(2.7)
Assumptions Used to Determine Benefit Obligation and Net Periodic Benefit Costs [Table Text Block] |
Assumptions Used to Determine Benefit Obligation
As of December 31 | 2015 | 2014
Discount Rate |  |
Pension | 4.72% | 4.30%
Postretirement Health and Life | 4.73% | 4.33%
Rate of Compensation Increase | 3.70 - 4.30% | 3.70 - 4.30%
Health Care Trend Rates |  |
Trend Rate | 6.50% | 6.75%
Ultimate Trend Rate | 5.00% | 5.00%
Year Ultimate Trend Rate Effective | 2022 | 2022
Assumptions Used to Determine Net Periodic Benefit Costs
Year Ended December 31 | 2015 | 2014 | 2013
Discount Rate | 4.30 - 4.33% | 4.93 - 4.96% | 4.10 - 4.13%
Expected Long-Term Return on Plan Assets |  |  |
Pension | 8.00% | 8.00% | 8.25%
Postretirement Health and Life | 6.40 - 8.00% | 6.40 - 8.00% | 6.60 - 8.25%
Rate of Compensation Increase | 3.70 - 4.30% | 3.70 - 4.30% | 4.30 - 4.60%
Plan Asset Allocations, Actual and Target [Table Text Block] |
Plan Asset Target Allocations | Pension | Postretirement Health and Life (a)
Equity Securities | 56 | % | 60 | %
Debt Securities | 35 | % | 37 | %
Real Estate | 9 | % | 3 | %
| 100 | % | 100 | %
(a) | Includes VEBAs and irrevocable grantor trusts.
Actual Plan Asset Allocations | Pension | Postretirement Health and Life (a)
| 2015 | 2014 | 2015 | 2014
Equity Securities | 47 | % | 48 | % | 57 | % | 58 | %
Debt Securities | 39 | % | 39 | % | 35 | % | 34 | %
Private Equity | 8 | % | 8 | % | 8 | % | 8 | %
Real Estate | 6 | % | 5 | % | — |  | — |
| 100 | % | 100 | % | 100 | % | 100 | %
(a) | Includes VEBAs and irrevocable grantor trusts.
Pension [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Obligation and Funded Status [Table Text Block] |
Pension Obligation and Funded Status
At December 31 | 2015 |  | 2014 |
Millions |  |
Accumulated Benefit Obligation |  | $665.0 |  |  | $661.4 |
Change in Benefit Obligation |  |  |  |
Obligation, Beginning of Year |  | $714.5 |  |  | $622.8 |
Service Cost | 10.1 |  | 8.3 |
Interest Cost | 29.9 |  | 29.8 |
Actuarial (Gain) Loss | (31.2 | ) | 72.6 |
Benefits Paid | (40.2 | ) | (36.9 | )
Participant Contributions | 26.7 |  | 17.9 |
Obligation, End of Year |  | $709.8 |  |  | $714.5 |
Change in Plan Assets |  |  |  |
Fair Value, Beginning of Year |  | $544.2 |  |  | $501.6 |
Actual Return on Plan Assets | (10.8 | ) | 41.0 |
Employer Contribution (a) | 28.1 |  | 38.5 |
Benefits Paid | (40.2 | ) | (36.9 | )
Fair Value, End of Year |  | $521.3 |  |  | $544.2 |
Funded Status, End of Year | $(188.5) | $(170.3)
Net Pension Amounts Recognized in Consolidated Balance Sheet Consist of: |  |  |  |
Current Liabilities | $(1.3) | $(1.2)
Non-Current Liabilities | $(187.2) | $(169.1)
(a) | Includes Participant Contributions noted above.
Unrecognized Costs [Table Text Block] | The pension costs that are reported as a component within our Consolidated Balance Sheet, reflected in long-term regulatory assets or liabilities and accumulated other comprehensive income, consist of the following:
Unrecognized Pension Costs
As of December 31 | 2015 |  | 2014 |
Millions |  |
Net Loss |  | $252.7 |  |  | $250.4 |
Prior Service Cost | — |  | 0.2 |
Total Unrecognized Pension Costs |  | $252.7 |  |  | $250.6 |
Components of Net Periodic Expense [Table Text Block] |
Components of Net Periodic Pension Expense
Year Ended December 31 | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Service Cost |  | $10.1 |  |  | $8.3 |  |  | $9.9 |
Interest Cost | 29.9 |  | 29.8 |  | 26.0 |
Expected Return on Plan Assets | (40.7 | ) | (38.2 | ) | (35.2 | )
Amortization of Loss | 17.9 |  | 14.2 |  | 21.5 |
Amortization of Prior Service Cost | 0.2 |  | 0.3 |  | 0.3 |
Net Pension Expense |  | $17.4 |  |  | $14.4 |  |  | $22.5 |
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities [Table Text Block] |
Other Changes in Pension Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31 | 2015 |  | 2014 |
Millions |  |
Net Loss | $20.2 | $69.8
Amortization of Prior Service Cost | (0.2 | ) | (0.3 | )
Amortization of Loss | (17.9 | ) | (14.2 | )
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $2.1 | $55.3
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets [Table Text Block] |
Information for Pension Plans with an Accumulated Benefit Obligation in Excess of Plan Assets
As of December 31 | 2015 |  | 2014 |
Millions |  |
Projected Benefit Obligation |  | $709.8 |  |  | $714.5 |
Accumulated Benefit Obligation |  | $665.0 |  |  | $661.4 |
Fair Value of Plan Assets |  | $521.3 |  |  | $544.2 |
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2014
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) |  | $32.1 |  |  | $56.4 |  | — |  |  | $88.5 |
U.S. Mid-cap Growth (a) | 13.6 |  | 23.9 |  | — |  | 37.5 |
U.S. Small-cap (a) | 13.9 |  | 24.4 |  | — |  | 38.3 |
International | 46.1 |  | 45.9 |  | — |  | 92.0 |
Debt Securities: |  |  |  |  |  |  |  |
Mutual Funds | 0.1 |  | — |  | — |  | 0.1 |
Fixed Income | 2.7 |  | 201.0 |  | — |  | 203.7 |
Cash and Cash Equivalents | 11.9 |  | — |  | — |  | 11.9 |
Other Types of Investments: |  |  |  |  |  |  |  |
Private Equity Funds | — |  | — |  |  | $43.3 |  | 43.3 |
Real Estate | — |  | — |  | 28.9 |  | 28.9 |
Total Fair Value of Assets |  | $120.4 |  |  | $351.6 |  |  | $72.2 |  |  | $544.2 |
(a) | The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.
| Fair Value as of December 31, 2015
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) |  | $33.9 |  |  | $42.1 |  | — |  |  | $76.0 |
U.S. Mid-cap Growth (a) | 14.2 |  | 17.7 |  | — |  | 31.9 |
U.S. Small-cap (a) | 14.5 |  | 17.9 |  | — |  | 32.4 |
Mutual Funds | 8.4 |  | — |  | — |  | 8.4 |
International | 44.7 |  | 42.0 |  | — |  | 86.7 |
Debt Securities: |  |  |  |  |  |  |  |
Mutual Funds | 0.1 |  | — |  | — |  | 0.1 |
Fixed Income | 2.7 |  | 185.3 |  | — |  | 188.0 |
Cash and Cash Equivalents | 25.6 |  | — |  | — |  | 25.6 |
Other Types of Investments: |  |  |  |  |  |  |  |
Private Equity Funds | — |  | — |  |  | $43.3 |  | 43.3 |
Real Estate | — |  | — |  | 28.9 |  | 28.9 |
Total Fair Value of Assets |  | $144.1 |  |  | $305.0 |  |  | $72.2 |  |  | $521.3 |
(a) | The underlying investments classified under U.S. Equity Securities consist of money market funds (Level 1) and actively-managed funds (Level 2), which are combined with futures, and settle daily, to achieve the returns of the U.S. Equity Securities Large-cap, Mid-cap Growth, and Small-cap funds. Our exposure with respect to these investments includes both the futures and the underlying investments.
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block] |
Recurring Fair Value Measures |  |  |
Activity in Level 3 |  | Private Equity Funds | Real Estate
Millions |  |  |
Balance as of December 31, 2013 |  |  | $46.8 |  |  | $26.5 |
Actual Return on Plan Assets |  | 1.2 |  | 2.8 |
Purchases, Sales, and Settlements – Net |  | (4.7 | ) | (0.4 | )
Balance as of December 31, 2014 |  |  | $43.3 |  |  | $28.9 |
Recurring Fair Value Measures |  |
Activity in Level 3 | Private Equity Funds | Real Estate
Millions |  |
Balance as of December 31, 2014 |  | $43.3 |  |  | $28.9 |
Actual Return on Plan Assets | 2.6 |  | 2.9 |
Purchases, Sales, and Settlements – Net | (2.6 | ) | (2.9 | )
Balance as of December 31, 2015 |  | $43.3 |  |  | $28.9 |
Postretirement Health and Life [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Obligation and Funded Status [Table Text Block] |
Postretirement Health and Life Obligation and Funded Status
At December 31 | 2015 |  | 2014 |
Millions |  |
Change in Benefit Obligation |  |
Obligation, Beginning of Year |  | $170.9 |  |  | $151.9 |
Service Cost | 4.3 |  | 3.4 |
Interest Cost | 7.2 |  | 7.3 |
Actuarial (Gain) Loss | (14.4 | ) | 18.1 |
Benefits Paid | (10.7 | ) | (8.9 | )
Participant Contributions | 2.9 |  | 2.6 |
Plan Amendments | — |  | (2.9 | )
Plan Curtailments | — |  | (0.6 | )
Obligation, End of Year |  | $160.2 |  |  | $170.9 |
Change in Plan Assets |  |
Fair Value, Beginning of Year |  | $163.2 |  |  | $157.0 |
Actual Return on Plan Assets | (3.5 | ) | 11.6 |
Employer Contribution | 1.5 |  | 1.1 |
Participant Contributions | 2.9 |  | 2.6 |
Benefits Paid | (10.7 | ) | (9.1 | )
Fair Value, End of Year |  | $153.4 |  |  | $163.2 |
Funded Status, End of Year | $(6.8) | $(7.7)
Net Postretirement Health and Life Amounts Recognized in Consolidated Balance Sheet Consist of: |  |
Non-Current Assets | $6.4 | $6.6
Current Liabilities | $(1.0) | $(0.9)
Non-Current Liabilities | $(12.2) | $(13.4)
Unrecognized Costs [Table Text Block] | The postretirement health and life costs that are reported as a component within our Consolidated Balance Sheet, reflected in regulatory long-term assets or liabilities and accumulated other comprehensive income, consist of the following:
Unrecognized Postretirement Health and Life Costs
As of December 31 | 2015 |  | 2014 |
Millions |  |
Net Loss | $6.5 | $6.9
Prior Service Credit | (7.6 | ) | (10.6 | )
Total Unrecognized Postretirement Health and Life Credit | $(1.1) | $(3.7)
Components of Net Periodic Expense [Table Text Block] |
Components of Net Periodic Postretirement Health and Life Expense
Year Ended December 31 | 2015 |  | 2014 |  | 2013 |
Millions |  |  |
Service Cost |  | $4.3 |  |  | $3.4 |  |  | $3.9 |
Interest Cost | 7.2 |  | 7.3 |  | 6.8 |
Expected Return on Plan Assets | (10.9 | ) | (10.3 | ) | (9.7 | )
Amortization of Loss | 0.4 |  | 0.5 |  | 1.6 |
Amortization of Prior Service Credit | (3.0 | ) | (2.5 | ) | (2.5 | )
Effect of Plan Settlement (a) | — |  | — |  | (1.6 | )
Net Postretirement Health and Life Credit | $(2.0) | $(1.6) | $(1.5)
(a) | Result of the termination of a legacy benefit plan.
Other Changes in Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities [Table Text Block] |
Other Changes in Postretirement Benefit Plan Assets and Benefit Obligations Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities
Year Ended December 31 | 2015 |  | 2014 |
Millions |  |  |
Net Loss | — |  | $16.4
Prior Service Credit Arising During the Period | — |  | (3.0 | )
Amortization of Prior Service Credit |  | $3.0 |  | 2.5 |
Amortization of Loss | (0.4 | ) | (0.5 | )
Total Recognized in Other Comprehensive Income and Regulatory Assets or Liabilities | $2.6 | $15.4
Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates [Table Text Block] |
Sensitivity of a One-Percentage-Point Change in Health Care Trend Rates
| One Percent Increase | One Percent Decrease
Millions |  |
Effect on Total of Postretirement Health and Life Service and Interest Cost |  | $1.9 |  | $(1.5)
Effect on Postretirement Health and Life Obligation |  | $19.3 |  | $(15.9)
Recurring Fair Value Measures [Table Text Block] |
| Fair Value as of December 31, 2015
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) |  | $28.2 |  | — |  | — |  |  | $28.2 |
U.S. Mid-cap Growth (a) | 19.1 |  | — |  | — |  | 19.1 |
U.S. Small-cap (a) | 12.1 |  | — |  | — |  | 12.1 |
International | 26.8 |  | — |  | — |  | 26.8 |
Debt Securities: |  |  |  |  |  |  |  |
Mutual Funds | 45.2 |  | — |  | — |  | 45.2 |
Fixed Income | — |  |  | $8.4 |  | — |  | 8.4 |
Cash and Cash Equivalents | 1.6 |  | — |  | — |  | 1.6 |
Other Types of Investments: |  |  |  |  |  |  |  |
Private Equity Funds | — |  | — |  |  | $12.0 |  | 12.0 |
Total Fair Value of Assets |  | $133.0 |  |  | $8.4 |  |  | $12.0 |  |  | $153.4 |
(a) | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).
| Fair Value as of December 31, 2014
Recurring Fair Value Measures | Level 1 | Level 2 | Level 3 | Total
Millions |  |  |  |
Assets: |  |  |  |
Equity Securities: |  |  |  |
U.S. Large-cap (a) |  | $29.3 |  | — |  | — |  |  | $29.3 |
U.S. Mid-cap Growth (a) | 20.0 |  | — |  | — |  | 20.0 |
U.S. Small-cap (a) | 12.6 |  | — |  | — |  | 12.6 |
International | 30.6 |  | — |  | — |  | 30.6 |
Debt Securities: |  |  |  |  |  |  |  |
Mutual Funds | 44.5 |  | — |  | — |  | 44.5 |
Fixed Income | — |  |  | $9.9 |  | — |  | 9.9 |
Cash and Cash Equivalents | 3.4 |  | — |  | — |  | 3.4 |
Other Types of Investments: |  |  |  |  |  |  |  |
Private Equity Funds | — |  | — |  |  | $12.9 |  | 12.9 |
Total Fair Value of Assets |  | $140.4 |  |  | $9.9 |  |  | $12.9 |  |  | $163.2 |
(a) | The underlying investments classified under U.S. Equity Securities consist of mutual funds (Level 1).
Recurring Fair Value Measures - Activity in Level 3 [Table Text Block] |
Recurring Fair Value Measures |
Activity in Level 3 | Private Equity Funds
Millions |
Balance as of December 31, 2013 |  | $13.1 |
Actual Return on Plan Assets | 1.4 |
Purchases, Sales, and Settlements – Net | (1.6 | )
Balance as of December 31, 2014 |  | $12.9 |
Recurring Fair Value Measures |
Activity in Level 3 | Private Equity Funds
Millions |
Balance as of December 31, 2014 |  | $12.9 |
Actual Return on Plan Assets | 1.2 |
Purchases, Sales, and Settlements – Net | (2.1 | )
Balance as of December 31, 2015 |  | $12.0 |

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