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Pension and Other Postretirement Employee Benefit Plans - (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Components of Net Periodic Cost of Pension and Other Postretirement Employee Benefit Plans | The following table details the components of net periodic cost of our company-sponsored pension and other postretirement employee benefit plans for the periods presented:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
Pension Benefit Plans | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.4 |  |  | $ | 0.5 |  |  | $ | 1.4 |  |  | $ | 1.7 |
Interest cost | 2.1 |  |  | 2.6 |  |  | 6.3 |  |  | 7.8 |
Expected return on plan assets | (2.6) |  |  | (3.8) |  |  | (7.9) |  |  | (11.3) |
Amortization of actuarial loss | 2.5 |  |  | 2.4 |  |  | 7.7 |  |  | 7.4 |
Net periodic cost | $ | 2.4 |  |  | $ | 1.7 |  |  | $ | 7.4 |  |  | $ | 5.6 |
| Quarter Ended September 30, |  | Nine Months Ended September 30,
Other Postretirement Employee Benefit Plans | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 0.2 |  |  | $ | — |  |  | $ | 0.3 |  |  | $ | 0.1 |
Interest cost | 0.6 |  |  | 0.6 |  |  | 1.5 |  |  | 1.8 |
Amortization of actuarial loss | 0.2 |  |  | — |  |  | 0.2 |  |  | — |
Net periodic cost | $ | 1.0 |  |  | $ | 0.7 |  |  | $ | 2.0 |  |  | $ | 1.8 |
Defined Contribution Plan Disclosures | We record the service component of net periodic cost (benefit) as part of "Cost of sales" and "Selling, general, and administrative expenses," while the non-service components of net periodic cost (benefit) are recorded to "Other non-operating expense" on our Consolidated Statements of Operations. For the quarter and nine months ended September 30, 2021, we recorded $0.6 million and $1.5 million to "Cost of sales" and less than $0.1 million and $0.2 million to "Selling, general, and administrative expenses." For the quarter and nine months ended September 30, 2020, we recorded $0.3 million and $1.1 million to "Cost of sales" and $0.2 million and $0.7 million to "Selling, general, and administrative expenses."

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- Definition Tabular disclosure of defined contribution pension plans or defined contribution other postretirement plans, separately for pension plans and other postretirement benefit plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920 + Details
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