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Defined Benefit and Postretirement Benefits (Tables) | 9 Months Ended
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Sep. 30, 2021
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures | For all plans, the components of net periodic benefit for the three months ended September 30, 2021 and 2020 are as follows:
| Pension |  | Postretirement
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 1.6 |  |  | $ | 1.6 |  |  | $ | 0.1 |  |  | $ | 0.1 |
Interest cost | 5.2 |  |  | 6.6 |  |  | 0.2 |  |  | 0.2 |
Expected return on plan assets | (14.8) |  |  | (14.7) |  |  | — |  |  | — |
Amortization of prior service cost | (0.1) |  |  | (0.1) |  |  | (0.3) |  |  | (0.3) |
Amortization of net loss | 6.5 |  |  | 4.8 |  |  | — |  |  | — |
Net periodic benefit | $ | (1.6) |  |  | $ | (1.8) |  |  | $ | — |  |  | $ | — |
For all plans, the components of net periodic benefit for the nine months ended September 30, 2021 and 2020 are as follows:
| Pension |  | Postretirement
(in millions) | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 4.7 |  |  | $ | 4.8 |  |  | $ | 0.3 |  |  | $ | 0.2 |
Interest cost | 15.7 |  |  | 19.9 |  |  | 0.5 |  |  | 0.6 |
Expected return on plan assets | (44.7) |  |  | (43.5) |  |  | — |  |  | — |
Recognized curtailment gain | (0.6) |  |  | — |  |  | — |  |  | — |
Amortization of prior service cost | (0.2) |  |  | (0.2) |  |  | (0.8) |  |  | (0.8) |
Amortization of net loss | 19.6 |  |  | 14.5 |  |  | — |  |  | — |
Net periodic benefit | $ | (5.5) |  |  | $ | (4.5) |  |  | $ | — |  |  | $ | — |
Schedule of Contributions By Benefit Plan Type | We expect to contribute the following to our pension and postretirement plans:
(in millions) | Pension |  | Postretirement
Expected contributions in 2021 | $ | 20.7 |  |  | $ | 2.6 |
Amounts contributed during the nine months ended September 30, 2021 | $ | 20.4 |  |  | $ | 2.4 |

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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=123450688&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=123447040&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=123447040&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=123447040&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=123447040&loc=d3e2417-114920 + Details
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