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Postretirement Benefits (Tables) | 12 Months Ended
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Dec. 31, 2017
Defined Benefit Plan [Abstract] |
Schedule of Net Pension and Other Benefit Costs | Costs. Pension and other postretirement benefit costs included the following components for 2017, 2016 and 2015:
| Pension Benefits |  | Other Postretirement Benefits
(in millions) | 2017 |  | 2016 |  | 2015 |  | 2017 |  | 2016 |  | 2015
Interest cost | $ | 28.4 |  |  | $ | 35.8 |  |  | $ | 47.9 |  |  | $ | 1.2 |  |  | $ | 1.4 |  |  | $ | 1.8 |
Expected return on plan assets | (33.5 | ) |  | (38.5 | ) |  | (55.7 | ) |  | — |  |  | — |  |  | — |
Amortization of prior service credits | — |  |  | — |  |  | — |  |  | (0.7 | ) |  | (0.7 | ) |  | (0.7 | )
Amortization of net actuarial losses | 14.4 |  |  | 17.4 |  |  | 19.5 |  |  | — |  |  | — |  |  | 1.3 |
Settlement charges | 96.6 |  |  | 55.1 |  |  | 82.3 |  |  | — |  |  | — |  |  | — |
Net pension and other benefit costs | $ | 105.9 |  |  | $ | 69.8 |  |  | $ | 94.0 |  |  | $ | 0.5 |  |  | $ | 0.7 |  |  | $ | 2.4 |
Reconciliation of the Changes in Plans Benefit Obligations, Fair Value of Plan Assets, and Statement of Funded Status | Benefit Obligations and Funded Status. A reconciliation of the changes in the benefit obligations and fair value of assets over the two-year period ending December 31, 2017, and a statement of the funded status at December 31 for these years for the Company's pension and other postretirement benefit plans follow:
| Pension Benefits |  | Other Postretirement Benefits
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Reconciliation of benefit obligation: |  |  |  |  |  |  |
Benefit obligation at previous December 31 | $ | 921.5 |  |  | $ | 1,035.5 |  |  | $ | 40.6 |  |  | $ | 43.5 |
Interest cost | 28.4 |  |  | 35.8 |  |  | 1.2 |  |  | 1.4 |
Participant contributions | — |  |  | — |  |  | 0.5 |  |  | 0.5 |
Actuarial (gains) losses | 58.0 |  |  | 49.0 |  |  | 0.0 |  |  | (0.9 | )
Benefit payments | (56.6 | ) |  | (73.6 | ) |  | (3.6 | ) |  | (3.9 | )
Settlement payments | (234.4 | ) |  | (125.2 | ) |  | — |  |  | — |
Benefit obligation at December 31 | 716.9 |  |  | 921.5 |  |  | 38.7 |  |  | 40.6 |
Reconciliation of fair value of plan assets: |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets at previous December 31 | 687.9 |  |  | 736.4 |  |  | — |  |  | — |
Actual return on plan assets | 75.5 |  |  | 75.7 |  |  | — |  |  | — |
Employer contributions | 73.7 |  |  | 74.6 |  |  | 3.1 |  |  | 3.4 |
Participant contributions | — |  |  | — |  |  | 0.5 |  |  | 0.5 |
Benefit payments | (56.6 | ) |  | (73.6 | ) |  | (3.6 | ) |  | (3.9 | )
Settlement payments | (234.4 | ) |  | (125.2 | ) |  | — |  |  | — |
Fair value of plan assets at December 31 | 546.1 |  |  | 687.9 |  |  | — |  |  | — |
Funded status at December 31 | $ | (170.8 | ) |  | $ | (233.6 | ) |  | $ | (38.7 | ) |  | $ | (40.6 | )
Funded percentage (A) | 76 | % |  | 75 | % |  | NA |  |  | NA |
(A) As all of the Company's plans are frozen, the projected benefit obligation and the accumulated benefit obligation are equal. As of December 31, 2017 and 2016, the projected and accumulated benefit obligations for all of the Company's pension plans were in excess of plan assets.
Schedule of Amounts Recognized in Consolidated Balance Sheet | The amounts included in the Company's Consolidated Balance Sheets as of December 31, 2017 and 2016, were as follows:
| Pension Benefits |  | Other Postretirement Benefits
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Accounts and notes receivable | $ | 3.5 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Assets recognized | 3.5 |  |  | — |  |  | — |  |  | — |
Accrued expenses | 3.8 |  |  | 10.5 |  |  | 3.7 |  |  | 4.1 |
Postretirement benefit liabilities | 170.5 |  |  | 223.1 |  |  | 35.0 |  |  | 36.5 |
Liabilities recognized | $ | 174.3 |  |  | $ | 233.6 |  |  | $ | 38.7 |  |  | $ | 40.6 |
Activity Recorded in Accumulated Other Comprehensive Income or Loss | Accumulated Other Comprehensive Loss. The following pretax activity related to pensions and other postretirement benefits was recorded in Accumulated other comprehensive loss as of December 31:
| Pension Benefits |  | Other Postretirement Benefits
(in millions) | 2017 |  | 2016 |  | 2017 |  | 2016
Prior service credits |  |  |  |  |  |  |
Beginning balance | $ | — |  |  | $ | — |  |  | $ | (10.2 | ) |  | $ | (10.9 | )
Amount recognized as component of net benefit costs | — |  |  | — |  |  | 0.7 |  |  | 0.7 |
Ending balance | — |  |  | — |  |  | (9.5 | ) |  | (10.2 | )
Net actuarial losses |  |  |  |  |  |  |
Beginning balance | 397.1 |  |  | 457.8 |  |  | 1.0 |  |  | 1.9 |
Actuarial (gains) losses arising during the period | 16.0 |  |  | 11.8 |  |  | 0.0 |  |  | (0.9 | )
Amount recognized as component of net benefit costs | (111.0 | ) |  | (72.5 | ) |  | — |  |  | — |
Ending balance | 302.1 |  |  | 397.1 |  |  | 1.0 |  |  | 1.0 |
Total | $ | 302.1 |  |  | $ | 397.1 |  |  | $ | (8.5 | ) |  | $ | (9.2 | )
Assumed Health Care Cost Trend Rates | The assumed health care cost trend rate for other postretirement benefits for pre-age 65 benefits as of December 31 was as follows:
| Pre-age 65 Benefits
| 2017 |  | 2016
Health care cost trend rate for next year | 5.6 | % |  | 5.7 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) | 4.5 | % |  | 4.5 | %
Year rate reaches the ultimate trend rate | 2037 |  |  | 2037 |
Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates | A one percent change in the assumed health care trend rate at December 31, 2017 would not have a material impact on the accumulated postretirement benefit obligation.
Weighted-Average Assumptions Used to Determine Benefit Obligations and Net Pension and Other Postretirement Benefit Costs | Weighted average assumptions used to determine pension and other postretirement benefit obligations at December 31 were as follows:
| Pension Benefits |  | Other Postretirement Benefits
| 2017 |  | 2016 |  | 2017 |  | 2016
Discount rate | 3.63 | % |  | 4.00 | % |  | 3.51 | % |  | 3.93 | %
Weighted average assumptions used to determine net pension and other postretirement benefit costs for the years ended December 31 were as follows:
| 2017 |  | 2016 |  | 2015
Discount rate for pension benefits (A) (B) | 3.40% |  | 3.58% |  | 3.95%
Discount rate for other postretirement benefits (A) (B) | 3.17% |  | 3.30% |  | 3.75%
Long-term rate of return on plan assets (C) | 4.75% |  | 5.25% |  | 6.00%
(A) The Company utilizes a yield curve analysis to calculate the discount rates used to determine pension and other postretirement benefit obligations. The yield curve analysis matches the cash flows of the Company's benefit obligations. The yield curve consisted of spot interest rates at half year increments for each of the next 30 years and was developed based on pricing and yield information for high quality corporate bonds rated Aa by either Moody's or Standard & Poor's, private placement bonds that are traded in reliance with Rule 144A and are at least two years from date of issuance, bonds with make-whole provisions and bonds issued by foreign corporations that are denominated in U.S. dollars, excluding callable bonds and bonds less than a minimum size and other filtering criteria. Additionally, the Company's yield curve methodology includes bonds having a yield that is greater than the regression mean yield curve as the Company believes this methodology represents an appropriate estimate of the rates at which the Company could effectively settle its pension obligations. (B) Pension expense in 2017 and 2016 includes the impact of a change in methodology used to calculate the interest cost component of pension expense. In 2015 and prior years, the Company used a single-weighted average discount rate to calculate pension and postretirement interest costs. Beginning in 2016, the Company is utilizing a "spot rate approach" in the calculation of pension and postretirement interest costs to provide a more accurate measurement of interest costs. The spot rate approach applies separate discount rates for each projected benefit payment in the calculation of pension and postretirement interest costs. This calculation change is considered to be a change in accounting estimate and is being applied prospectively starting in 2016.
Schedule of Allocation of Plan Assets | The Trust asset allocation at December 31, 2017 and 2016, and target allocation for 2018 are as follows:
| 2017 |  | 2016 |  | Target Allocation for 2018
Equity securities: |  |  |  |  |
United States | 4% |  | 19% |  | 4%
International | 1% |  | 3% |  | 1%
Fixed-income securities | 89% |  | 75% |  | 95%
Short-term investments | 6% |  | 3% |  | —%
Total | 100% |  | 100% |  | 100%
The fair values of the Trust's pension assets at December 31, 2017, by asset class were as follows:
| Fair Value Measurements at December 31, 2017 (A)
(in millions) | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  |
Investments at fair value | (Level 1) |  | (Level 2) |  | Total
Short-term investments | $ | 15.2 |  |  | $ | — |  |  | $ | 15.2 |
Fixed-income securities: |  |  |  |  |
Government securities (C) | — |  |  | 114.1 |  |  | 114.1 |
Corporate securities (D) | — |  |  | 324.0 |  |  | 324.0 |
Other investments (F) | — |  |  | 9.2 |  |  | 9.2 |
Total investments at fair value | $ | 15.2 |  |  | $ | 447.3 |  |  | $ | 462.5 |
Investments at net asset value |  |  |  |  |
Short-term investments |  |  |  |  | 25.0 |
Equity securities (B) |  |  |  |  |
United States |  |  |  |  | 23.9 |
International |  |  |  |  | 5.6 |
Fixed-income securities: |  |  |  |  |
Commingled funds (E) |  |  |  |  | 65.2 |
Total investments at net asset value |  |  |  |  | 119.7 |
Other liabilities (G) |  |  |  |  | (36.1 | )
Total pension plan net assets |  |  |  |  | $ | 546.1 |
(A) | See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1 and Level 2 in 2017.
(B) | The equity assets are invested in two indexed funds based on the Russell 3000 Index (U.S.) and the MSCI EAFE Equity Index (International). The Trust did not directly own any of the Company's common stock as of December 31, 2017.
(C) | Government securities are comprised of U.S. Treasury bonds and other government securities.
(D) | Corporate securities consist primarily of a diversified portfolio of investment grade bonds issued by companies.
(E) | This class includes commingled funds that primarily invest in investment grade corporate securities and government-related securities. This class also includes investments in non-agency collateralized mortgage obligations and mortgage-backed securities, futures and options.
(F) | Other investments consist primarily of interest rate swaps used to manage the average duration of the fixed income portfolio and credit default swaps to manage credit risk exposure.
(G) | This class includes interest receivable and receivables/payables for securities sold/purchased.
The fair values of the Trust's pension assets at December 31, 2016, by asset class were as follows:
| Fair Value Measurements at December 31, 2016 (A)
(in millions) | Quoted Prices in Active Markets for Identical Assets |  | Significant Observable Inputs |  |
Investments at fair value | (Level 1) |  | (Level 2) |  | Total
Short-term investments | $ | 1.9 |  |  | $ | — |  |  | $ | 1.9 |
Fixed-income securities: |  |  |  |  |
Government securities (C) | — |  |  | 141.5 |  |  | 141.5 |
Corporate securities (D) | — |  |  | 382.1 |  |  | 382.1 |
Other investments (F) | (0.4 | ) |  | 8.9 |  |  | 8.5 |
Total investments at fair value | $ | 1.5 |  |  | $ | 532.5 |  |  | $ | 534.0 |
Investments at net asset value |  |  |  |  |
Short-term investments |  |  |  |  | 46.8 |
Equity securities (B) |  |  |  |  |
United States |  |  |  |  | 132.8 |
International |  |  |  |  | 17.6 |
Fixed-income securities: |  |  |  |  |
Commingled funds (E) |  |  |  |  | 15.3 |
Total investments at net asset value |  |  |  |  | 212.5 |
Other liabilities (G) |  |  |  |  | (58.6 | )
Total pension plan net assets |  |  |  |  | $ | 687.9 |
(A) | See Note 7 – Fair Value Measurements for a description of levels within the fair value hierarchy. The level in the fair value hierarchy within which the fair value measurement is classified is determined based on the lowest level input that is significant to the fair value measurement in its entirety. A description of the valuation methodologies is provided following these tables. There were no transfers in and/or out of Level 1 and Level 2 in 2016.
(B) | The equity assets are invested in two indexed funds based on the Russell 3000 Index (U.S.) and the MSCI EAFE Equity Index (International). The Trust did not directly own any of the Company's common stock as of December 31, 2016.
(C) | Government securities are comprised of U.S. Treasury bonds and other government securities.
(D) | Corporate securities consist primarily of a diversified portfolio of investment grade bonds issued by companies.
(E) | This class includes commingled funds that primarily invest in investment grade corporate securities and government-related securities. This class also includes investments in non-agency collateralized mortgage obligations and mortgage-backed securities, futures and options.
(F) | Other investments consist primarily of interest rate swaps used to manage the average duration of the fixed income portfolio and credit default swaps to manage credit risk exposure.
(G) | This class includes interest receivable and receivables/payables for securities sold/purchased.
Schedule of Expected Cash Flows | Expected Cash Flows. The expected cash flows for the Company's pension and other postretirement benefit plans follow:
(in millions) | Pension Benefits |  | Other Postretirement Benefits
Company contributions expected to be made in 2018 (A) | $ | 73.8 |  |  | $ | 3.7 |
Expected benefit payments: |  |  |
2018 | 44.4 |  |  | 3.7 |
2019 | 45.0 |  |  | 3.6 |
2020 | 45.3 |  |  | 3.4 |
2021 | 45.1 |  |  | 3.1 |
2022 | 45.1 |  |  | 2.9 |
2023-2027 | 221.6 |  |  | 12.6 |
(A) The Company anticipates making discretionary contributions of approximately $70.0 million to fund the qualified pension plans and approximately $3.8 million to cover benefit payments in the unfunded, nonqualified pension plan in 2018. Company contributions are subject to change based on market conditions or Company discretion.

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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. Also includes the expected entity's contribution to pension plans and/or other employee benefit plans the next fiscal year. + References No definition available. + 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=82843861&loc=d3e1928-114920 + Details
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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=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care 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 (m) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumed health care cost trend rates for the next year used to measure the expected cost of benefits covered by the plans, including the ultimate trend rate(s) and when that rate is expected to be achieved. + 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 (l) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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