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Employee Benefit Plans (Tables) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2018 | Dec. 31, 2017
Components of Net Periodic Cost for Defined Benefit Pension Plan and Other Postretirement Benefit Plan | The components of net periodic cost for our defined benefit pension plan and for our postretirement benefit plan are included in the following tables:
|  | Nine Months Ended September 30, |
Net Periodic Pension Cost |  | 2018 |  |  | 2017 |
Interest cost |  | $ | 12.3 |  |  | $ | 12.9 |
Actuarial loss amortization |  |  | 10.8 |  |  |  | 9.6 |
Less: Expected return on plan assets |  |  | (19.5 | ) |  |  | (19.8 | )
Net periodic pension cost |  | $ | 3.6 |  |  | $ | 2.7 |
|  | Nine Months Ended September 30, |
Net Periodic Postretirement Benefit |  | 2018 |  |  | 2017 |
Service benefit |  | $ | (0.3 | ) |  | $ | (0.3 | )
Interest cost |  |  | 0.3 |  |  |  | 0.3 |
Actuarial gain amortization |  |  | (1.8 | ) |  |  | (1.8 | )
Net periodic postretirement benefit gain |  | $ | (1.8 | ) |  | $ | (1.8 | )
Schedule of Future Payments to Participants from Defined Benefit Plans |  | The projected future payments to participants from defined benefit plans are included in the table below.
Years Ending December 31, |  | Amount |
2018 |  | $ | 46.8 |
2019 |  |  | 46.3 |
2020 |  |  | 45.4 |
2021 |  |  | 44.4 |
2022 |  |  | 43.1 |
Next five years |  | $ | 193.5 |
Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefits |  | The accompanying tables reflect the combined funded status and net periodic pension cost and combined supporting assumptions for the defined benefit elements of our defined benefit plans.
|  | Year Ended December 31, |
| 2017 |  |  | 2016 |
Funded Status of Defined Benefit Retirement Plans at Measurement Date |  |  |  |  |  |  |  |
Change in Projected Benefit Obligation During the Year: |  |  |  |  |  |  |  |
Projected benefit obligation at beginning of year |  | $ | 605.9 |  |  | $ | 636.0 |
Service cost |  |  | — |  |  |  | — |
Interest cost |  |  | 17.2 |  |  |  | 18.2 |
Actuarial loss |  |  | 20.3 |  |  |  | 4.3 |
Benefits paid and plan expenses |  |  | (50.4 | ) |  |  | (52.6 | )
Projected benefit obligation at end of year |  | $ | 593.0 |  |  | $ | 605.9 |
Change in Fair Value of Plan Assets During the Year: |  |  |  |  |  |  |  |
Plan assets at fair value at beginning of year |  |  | 416.4 |  |  |  | 410.1 |
Actual return on plan assets |  |  | 49.6 |  |  |  | 20.5 |
Employer contributions |  |  | 23.0 |  |  |  | 38.4 |
Benefits paid and plan expenses |  |  | (50.4 | ) |  |  | (52.6 | )
Plan assets at fair value at end of year |  |  | 438.6 |  |  |  | 416.4 |
Funded status of plans |  | $ | (154.4 | ) |  | $ | (189.5 | )
|  | December 31, |
|  | 2017 |  |  | 2016 |
Amounts recognized in Consolidated Balance Sheets |  |  |  |  |  |  |  |
Current liability |  | $ | 20.3 |  |  | $ | 27.1 |
Noncurrent liability |  |  | 134.1 |  |  |  | 162.4 |
Amounts recognized in Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Accumulated other comprehensive loss, net of tax of $91.5 and $91.5, respectively |  | $ | 151.4 |  |  | $ | 167.2 |
Schedule of Other Comprehensive (Income) Loss Related to Pension Benefit Plans and Postretirement Benefits |  | The other comprehensive (income) loss related to postretirement benefits is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net actuarial gain |  | $ | (0.7 | ) |  | $ | (1.4 | ) |  | $ | (4.5 | )
Amortization of net actuarial gain |  |  | 2.7 |  |  |  | 2.6 |  |  |  | 2.0 |
Tax expense |  |  | — |  |  |  | — |  |  |  | — |
Other comprehensive loss (income), net of tax |  | $ | 2.0 |  |  | $ | 1.2 |  |  | $ | (2.5 | )
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net Periodic Postretirement Benefit |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | — |  |  | $ | — |  |  | $ | — |
Interest cost |  |  | 0.5 |  |  |  | 0.6 |  |  |  | 0.9 |
Actuarial gain amortization |  |  | (2.4 | ) |  |  | (2.3 | ) |  |  | (1.7 | )
Prior service credit amortization |  |  | (0.3 | ) |  |  | (0.3 | ) |  |  | (0.3 | )
Net periodic postretirement benefit gain |  | $ | (2.2 | ) |  | $ | (2.0 | ) |  | $ | (1.1 | )
The amount in accumulated other comprehensive loss that is expected to be recognized as a component of net periodic postretirement benefit cost during 2018 is a $2.5 gain, comprised of $2.2 of actuarial gain and $0.3 of prior service credit. The assumed health care cost trend rate represents the rate at which health care costs are assumed to increase. The assumed health care cost trend rate used in measuring the benefit obligation in 2017 is 6.75% for pre-age 65 retirees and 7.25% for post-age 65 retirees. These rates are assumed to decrease gradually to the ultimate health care cost trend rate of 4.5% in 2028 for both groups. A one percent increase in this rate would increase the benefit obligation at December 31, 2017, by $0.9 million and would have an immaterial impact on the interest cost for 2017. A one percent decrease in this rate would decrease the benefit obligation at December 31, 2017, by $0.8 million and would have an immaterial impact on the interest cost for 2017.
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Assumption Used in Calculations |  |  |  |  |  |  |  |  |  |  |  |
Weighted average discount rate used to determine net periodic postretirement cost (credit) |  |  | 3.26 | % |  |  | 3.38 | % |  |  | 3.25 | %
Weighted average discount rate used to determine benefit obligation at measurement date |  |  | 3.01 | % |  |  | 3.26 | % |  |  | 3.38 | %
Schedule of Fair Value of Defined Benefit Plan Assets |  | The fair values of the defined benefit plan’s assets at December 31, 2017, by asset category are as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Investments, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  | $ | 36.8 |  |  | $ | 36.8 |  |  | $ | — |  |  | $ | — |
Derivatives (a) |  |  | 14.8 |  |  |  | — |  |  |  | 14.8 |  |  |  |  |
Government securities |  |  | 88.1 |  |  |  | — |  |  |  | 88.1 |  |  |  | — |
Corporate debt securities |  |  | 18.3 |  |  |  | — |  |  |  | 18.3 |  |  |  | — |
Collective investment funds: |  |  | — |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equity (b) |  |  | 144.4 |  |  |  | — |  |  |  | 144.4 |  |  |  | — |
Foreign equity (b) |  |  | 57.5 |  |  |  | — |  |  |  | 57.5 |  |  |  | — |
Foreign bond (c) |  |  | 41.8 |  |  |  | — |  |  |  | 41.8 |  |  |  | — |
Partnerships (d) |  |  | 35.3 |  |  |  | — |  |  |  | 35.3 |  |  |  | — |
Hedge fund of funds (e) |  |  | 1.6 |  |  |  | — |  |  |  | 1.6 |  |  |  | — |
Total investments, at fair value |  | $ | 438.6 |  |  | $ | 36.8 |  |  | $ | 401.8 |  |  | $ | — |
The fair values of our defined benefit plan’s assets at December 31, 2016, by asset category are as follows:
|  | Total |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |
Investments, at fair value: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term investments |  | $ | 34.0 |  |  | $ | 34.0 |  |  | $ | — |  |  | $ | — |
Derivatives (a) |  |  | 19.0 |  |  |  |  |  |  |  | 19.0 |  |  |  |  |
Government securities |  |  | 88.9 |  |  |  | — |  |  |  | 88.9 |  |  |  | — |
Corporate debt securities |  |  | 25.5 |  |  |  | — |  |  |  | 25.5 |  |  |  | — |
Collective investment funds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Domestic equity (b) |  |  | 66.7 |  |  |  | — |  |  |  | 66.7 |  |  |  | — |
Foreign equity (b) |  |  | 86.0 |  |  |  | — |  |  |  | 86.0 |  |  |  | — |
Foreign bond (c) |  |  | 33.3 |  |  |  | — |  |  |  | 33.3 |  |  |  | — |
Partnerships (d) |  |  | 32.7 |  |  |  | — |  |  |  | 32.7 |  |  |  | — |
Hedge fund of funds (e) |  |  | 30.3 |  |  |  | — |  |  |  | 30.3 |  |  |  | — |
Total investments, at fair value |  | $ | 416.4 |  |  | $ | 34.0 |  |  | $ | 382.4 |  |  | $ | — |
(a) | Funds in this category invest in interest rate swaps to reduce exposure to long-term interest rate risk and to achieve overall investment portfolio objectives.
(b) | Funds in this category invest in a diversified portfolio of domestic and/or foreign stocks to achieve a long-term rate of return.
(c) | Funds in this category invest in various types of domestic and/or foreign debt securities to achieve a long-term rate of return while preserving capital.
(d) | Funds within this category invest in a bond fund partnership which holds various types of domestic debt securities to achieve a long-term rate of return while preserving capital.
(e) | Funds within this category invest in various underlying hedge funds and are designed to provide superior risk adjusted returns as well as portfolio diversification relative to traditional asset classes.
Projected Future Postretirement Benefit Payments and Future Receipts from the Federal Subsidy |  | The projected future postretirement benefit payments and future receipts from the federal subsidy for each of the next five years and the five-year period following are included in the table below.
Years Ending December 31, |  | Payments |  |  | Receipts |
2018 |  | $ | 2.5 |  |  | $ | 0.1 |
2019 |  |  | 2.2 |  |  |  | 0.1 |
2020 |  |  | 2.1 |  |  |  | 0.1 |
2021 |  |  | 2.0 |  |  |  | 0.1 |
2022 |  |  | 1.9 |  |  |  | 0.1 |
Next five years |  | $ | 7.3 |  |  | $ | 0.3 |
Defined Benefit Pension Plan [Member] |  |
Schedule of Other Comprehensive (Income) Loss Related to Pension Benefit Plans and Postretirement Benefits |  | The other comprehensive (income) loss related to pension benefit plans is as follows:
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net actuarial (gain) loss |  | $ | (3.0 | ) |  | $ | 9.5 |  |  | $ | 2.2 |
Amortization of net actuarial loss |  |  | (12.8 | ) |  |  | (12.5 | ) |  |  | (13.3 | )
Tax expense |  |  | — |  |  |  | 0.1 |  |  |  | — |
Other comprehensive income, net of tax |  | $ | (15.8 | ) |  | $ | (2.9 | ) |  | $ | (11.1 | )
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Assumption Used in Calculations |  |  |  |  |  |  |  |  |  |  |  |
Discount rate used to determine net benefit cost |  |  | 3.63 | % |  |  | 3.76 | % |  |  | 3.50 | %
Expected return on plan assets |  |  | 6.30 | % |  |  | 6.30 | % |  |  | 6.50 | %
Discount rate used to determine benefit obligations |  |  | 3.25 | % |  |  | 3.63 | % |  |  | 3.76 | %
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Net Periodic Pension Cost |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 17.2 |  |  | $ | 18.2 |  |  | $ | 23.3 |
Expected return on plan assets |  |  | (26.3 | ) |  |  | (25.7 | ) |  |  | (26.6 | )
Actuarial loss amortization |  |  | 12.8 |  |  |  | 12.5 |  |  |  | 13.3 |
Net periodic pension cost |  | $ | 3.7 |  |  | $ | 5.0 |  |  | $ | 10.0 |
Other Postretirement Benefits Plan [Member] |  |
Schedule of Combined Funded Status and Net Periodic Pension Cost and Postretirement Benefits |  | The accompanying tables present the amounts and changes in the aggregate benefit obligation and the components of net periodic postretirement benefit cost for U.S. plans. We fund these costs as they become due.
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |
Funded Status of Postretirement Health Care and Life Insurance Plans |  |  |  |  |  |  |  |
Change in Benefit Obligation: |  |  |  |  |  |  |  |
At beginning of year |  | $ | 21.0 |  |  | $ | 23.2 |
Interest cost |  |  | 0.5 |  |  |  | 0.6 |
Participant contributions |  |  | 1.1 |  |  |  | 1.2 |
Actuarial gain |  |  | (0.7 | ) |  |  | (1.4 | )
Benefits paid |  |  | (2.3 | ) |  |  | (2.6 | )
At end of year |  | $ | 19.6 |  |  | $ | 21.0 |
Change in Plan Assets: |  |  |  |  |  |  |  |
At beginning of year |  | $ | — |  |  | $ | — |
Company contributions |  |  | 1.2 |  |  |  | 1.5 |
Participant contributions |  |  | 1.1 |  |  |  | 1.1 |
Benefits paid |  |  | (2.3 | ) |  |  | (2.6 | )
At end of year |  |  | — |  |  |  | — |
Funded Status |  | $ | (19.6 | ) |  | $ | (21.0 | )
|  | December 31, |
|  | 2017 |  |  | 2016 |
Amounts recognized in Consolidated Balance Sheets |  |  |  |  |  |  |  |
Current liability |  | $ | 2.4 |  |  | $ | 2.6 |
Noncurrent liability |  |  | 17.2 |  |  |  | 18.4 |
Amounts recognized in Accumulated Other Comprehensive Loss |  |  |  |  |  |  |  |
Accumulated other comprehensive income, net of tax of $(9.9) and $(9.9), respectively |  | $ | (8.9 | ) |  | $ | (10.9 | )

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