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Postretirement Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Postretirement Benefit Plans [Member] |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The following table sets forth the net periodic benefit cost for the Company’s other postretirement benefit plans. The amounts for the three and nine months ended September 30, 2019 are based on calculations prepared by the Company's actuaries and represent the Company’s best estimate of the respective period’s proportionate share of the amounts to be recorded for the year ending December 31, 2019.
| Three Months Ended September 30, | Nine Months Ended September 30,
| 2019 | 2018 | 2019 | 2018
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | — |  | $ | — |  | $ | 0.1 |  | $ | 0.1 |
Interest cost | 1.2 |  | 1.9 |  | 5.0 |  | 5.6 |
Expected return on plan assets | (0.8 | ) | (0.9 | ) | (2.4 | ) | (2.8 | )
Amortization of prior service credit | (2.0 | ) | (0.4 | ) | (3.1 | ) | (1.2 | )
Recognition of net actuarial losses | 9.9 |  | — |  | 9.9 |  | — |
Net periodic benefit cost | $ | 8.3 |  | $ | 0.6 |  | $ | 9.5 |  | $ | 1.7 |
During July 2019, the Company announced changes to the medical plan offerings for certain of its postretirement benefit plans, effective January 1, 2020, which will impact the benefits provided to certain retirees. This plan amendment (1) resulted in a $103.5 million reduction in the postretirement benefit obligation and a corresponding pretax adjustment to accumulated other comprehensive loss; and (2) triggered a remeasurement of the postretirement benefit obligation, and as a result the Company recognized an actuarial loss of $9.9 million during the three months ended September 30, 2019. Starting with the three months ended September 30, 2019, the pretax adjustment of $103.5 million will be amortized from accumulated other comprehensive loss into net periodic benefit cost (as a benefit) over the next twelve years.

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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