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Postretirement Benefit Plans - Net Periodic Postretirement Cost Recognized in Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Net periodic postretirement cost |  |  |  |  |
Service cost | $ 1.8 | $ 2.1 |  |  |
Interest cost | 3.5 | 2.8 |  |  |
Pension settlement charges | 0.0 | 0.0 |  | $ 137.0 |
Pension Plan [Member] |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |
Service cost | 1.2 | 1.4 |  | 1.5 |
Interest cost | 1.3 | 1.0 |  | 7.9 |
Expected return on plan assets | 0.0 | 0.0 |  | (7.2) |
Amortization of net actuarial loss | 1.3 | 1.8 |  | 6.3 |
Net periodic postretirement cost | 3.8 | 4.2 |  | 8.5 |
Pension settlement charges | 0.0 | (3.4) | [1] | 137.0 | [1]
Total net periodic postretirement cost | 3.8 | 0.8 |  | 145.5 |
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |
Net actuarial (gain) loss | (21.3) | (6.4) |  | 37.9 |
Amortization of net actuarial loss | (1.3) | (1.8) |  | (143.3) |
Foreign currency translation | (1.7) | (2.7) |  | 2.9 |
Total change recognized in other comprehensive income | (24.3) | (10.9) |  | (102.5) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | (20.5) | (10.1) |  | 43.0 |
Other Postretirement Benefits Plan [Member] |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |
Service cost | 0.6 | 0.7 |  | 0.8 |
Interest cost | 2.2 | 1.8 |  | 2.8 |
Amortization of net actuarial loss | 1.8 | 2.6 |  | 2.6 |
Amortization of prior service cost | (5.5) | (5.1) |  | (5.1) |
Total net periodic postretirement cost | (0.9) | 0.0 |  | 1.1 |
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |
Net actuarial (gain) loss | (23.3) | (8.2) |  | 3.9 |
Prior service cost | (8.1) | 0.0 |  | 0.0 |
Amortization of net actuarial loss | (1.8) | (2.6) |  | (2.6) |
Amortization of prior service cost | 5.5 | 5.1 |  | 5.1 |
Total change recognized in other comprehensive income | (27.7) | (5.7) |  | 6.4 |
Total impact from net periodic postretirement cost and changes in other comprehensive income | (28.6) | (5.7) |  | 7.5 |
International Plan [Member] | Pension Plan [Member] |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |
Service cost | 1.2 | 1.4 |  | 1.5 |
Interest cost | 1.0 | 0.7 |  | 1.0 |
Expected return on plan assets | 0.0 | 0.0 |  | 0.0 |
Amortization of net actuarial loss | 1.1 | 1.6 |  | 1.5 |
Net periodic postretirement cost | 3.3 | 3.7 |  | 4.0 |
Pension settlement charges | 0.0 | 0.0 |  | 0.1 |
Total net periodic postretirement cost | 3.3 | 3.7 |  | 4.1 |
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |
Net actuarial (gain) loss | (18.3) | (6.3) |  | 3.2 |
Amortization of net actuarial loss | (1.1) | (1.6) |  | (1.6) |
Foreign currency translation | (1.7) | (2.7) |  | 2.9 |
Total change recognized in other comprehensive income | (21.1) | (10.6) |  | 4.5 |
Total impact from net periodic postretirement cost and changes in other comprehensive income | (17.8) | (6.9) |  | 8.6 |
United States | Pension Plan [Member] |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |
Service cost | 0.0 | 0.0 |  | 0.0 |
Interest cost | 0.3 | 0.3 |  | 6.9 |
Expected return on plan assets | 0.0 | 0.0 |  | (7.2) |
Amortization of net actuarial loss | 0.2 | 0.2 |  | 4.8 |
Net periodic postretirement cost | 0.5 | 0.5 |  | 4.5 |
Pension settlement charges | 0.0 | (3.4) | [1] | 136.9 | [1]
Total net periodic postretirement cost | 0.5 | (2.9) |  | 141.4 |
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |
Net actuarial (gain) loss | (3.0) | (0.1) |  | 34.7 |
Amortization of net actuarial loss | (0.2) | (0.2) |  | (141.7) |
Foreign currency translation | 0.0 | 0.0 |  | 0.0 |
Total change recognized in other comprehensive income | (3.2) | (0.3) |  | (107.0) |
Total impact from net periodic postretirement cost and changes in other comprehensive income | $ (2.7) | $ (3.2) |  | $ 34.4 |
[1] | 2021 includes income of $3.4 from a pricing adjustment associated with the termination and sale of the U.S. qualified pension plan. In 2020, the Company recorded a settlement charge of $136.9 related to the termination and sale of the U.S. qualified pension plan.

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