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Pension and Other Postretirement Benefits (Tables) | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Summary of Net Periodic Pension and Other Postemployment Benefit Costs | The components of net periodic pension cost were as follows (in millions):
| Three months ended March 31,
| 2019 |  | 2018
Service cost (1) | $ | 0.5 |  |  | $ | 2.7 |
Interest cost (2) | 7.3 |  |  | 6.3 |
Expected return on plan assets (2) | (9.1 | ) |  | (9.4 | )
Amortization of net loss (2) | 2.3 |  |  | 7.8 |
Amortization of prior service credit (2) | — |  |  | (1.2 | )
Net periodic pension cost | $ | 1.0 |  |  | $ | 6.2 |
(1) Included in Direct operating costs and Selling, general and administrative on the Condensed Consolidated Statements of Operations
(2) Included in Other - net on the Condensed Consolidated Statements of Operations
The components of net periodic cost of other postretirement benefits were as follows (in millions):
| Three months ended March 31,
| 2019 |  | 2018
Service cost (1) | $ | — |  |  | $ | — |
Interest cost (2) | 0.1 |  |  | 0.1 |
Amortization of net loss (2) | 0.1 |  |  | 0.2 |
Amortization of prior service credit (2) | (3.0 | ) |  | (3.3 | )
Total other postretirement benefit cost | $ | (2.8 | ) |  | $ | (3.0 | )
(1) Included in Direct operating costs and Selling, general and administrative on the Condensed Consolidated Statements of Operations
(2) Included in Other - net on the Condensed Consolidated Statements of Operations

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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=112275985&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=108410482&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=108410482&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=108410482&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=108410482&loc=d3e2417-114920 + Details
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