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Pensions and Other Postretirement Benefits | 6 Months Ended
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Jun. 30, 2021
Retirement Benefits [Abstract] |
Pensions and Other Postretirement Benefits | Pensions and Other Postretirement Benefits The following table summarizes the components of net annual benefit cost (income):
(in Millions) | Three Months Ended June 30, |  | Six Months Ended June 30,
Pensions |  | Other Benefits |  | Pensions |  | Other Benefits
2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020 |  | 2021 |  | 2020
Service cost | $ | 1.3 |  |  | $ | 1.3 |  |  | $ | — |  |  | $ | — |  |  | $ | 2.6 |  |  | $ | 2.2 |  |  | $ | — |  |  | $ | — |
Interest cost | 6.1 |  |  | 9.2 |  |  | — |  |  | 0.1 |  |  | 12.2 |  |  | 18.3 |  |  | 0.1 |  |  | 0.2 |
Expected return on plan assets | (7.0) |  |  | (9.3) |  |  | — |  |  | — |  |  | (14.1) |  |  | (18.6) |  |  | — |  |  | — |
Amortization of prior service cost (credit) | — |  |  | — |  |  | — |  |  | — |  |  | 0.1 |  |  | 0.1 |  |  | — |  |  | — |
Recognized net actuarial and other (gain) loss | 5.9 |  |  | 2.4 |  |  | (0.2) |  |  | (0.2) |  |  | 11.8 |  |  | 4.9 |  |  | (0.4) |  |  | (0.4) |
Net periodic benefit cost (income) | $ | 6.3 |  |  | $ | 3.6 |  |  | $ | (0.2) |  |  | $ | (0.1) |  |  | $ | 12.6 |  |  | $ | 6.9 |  |  | $ | (0.3) |  |  | $ | (0.2) |

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