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Postretirement Benefit Plans - Other Changes in Plan Assets and Net Periodic Postretirement Cost Recognized in Other Comprehensive Income (Loss) (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Net periodic postretirement cost |  |  |
Service cost | $ 2.3 | $ 2.1 |
Interest cost | 10.7 | 16.6 |
Settlement charges | 137.0 | 0.0 | $ 1.7
Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.5 | 1.4 | 1.7
Interest cost | 7.9 | 12.6 | 11.5
Expected return on plan assets | (7.2) | (14.8) | (15.8)
Amortization of net actuarial loss | 6.3 | 5.1 | 5.8
Amortization of prior service cost | 0.0 | 0.7 | 0.9
Net periodic postretirement cost | 8.5 | 5.0 | 4.1
Settlement charges | 137.0 | 0.0 | 1.7
Total net periodic postretirement cost | 145.5 | 5.0 | 5.8
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 37.9 | 0.1 | 16.2
Prior service cost | 0.0 | 0.0 | (0.1)
Amortization of net actuarial loss | (143.3) | (5.1) | (7.5)
Amortization of prior service cost | 0.0 | (0.7) | (0.9)
Foreign currency translation | 2.9 | (0.3) | (1.0)
Total change recognized in other comprehensive income | (102.5) | (6.0) | 6.7
Total impact from net periodic postretirement cost and changes in other comprehensive income | 43.0 | (1.0) | 12.5
Other Postretirement Benefits Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.8 | 0.7 | 0.9
Interest cost | 2.8 | 4.0 | 4.5
Expected return on plan assets | 0.0 | (0.2) | (0.1)
Amortization of net actuarial loss | 2.6 | 2.3 | 4.0
Amortization of prior service cost | (5.1) | (5.1) | (5.3)
Total net periodic postretirement cost | 1.1 | 1.7 | 4.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 3.9 | 3.4 | (15.6)
Prior service cost | 0.0 | 1.7 | 0.0
Amortization of net actuarial loss | (2.6) | (2.3) | (4.0)
Amortization of prior service cost | 5.1 | 5.1 | 5.3
Total change recognized in other comprehensive income | 6.4 | 7.9 | (14.3)
Total impact from net periodic postretirement cost and changes in other comprehensive income | 7.5 | 9.6 | (10.3)
United States | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.0 | 0.2 | 0.4
Interest cost | 6.9 | 11.1 | 10.1
Expected return on plan assets | (7.2) | (14.8) | (15.8)
Amortization of net actuarial loss | 4.8 | 4.3 | 4.9
Amortization of prior service cost | 0.0 | 0.7 | 0.9
Net periodic postretirement cost | 4.5 | 1.5 | 0.5
Settlement charges | 136.9 | 0.0 |
Total net periodic postretirement cost | 141.4 | 1.5 | 2.2
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 34.7 | (10.2) | 15.4
Prior service cost | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | (141.7) | (4.3) | (6.6)
Amortization of prior service cost | 0.0 | (0.7) | (0.9)
Foreign currency translation | 0.0 | 0.0 | 0.0
Total change recognized in other comprehensive income | (107.0) | (15.2) | 7.9
Total impact from net periodic postretirement cost and changes in other comprehensive income | 34.4 | (13.7) | 10.1
International Plan [Member] | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.5 | 1.2 | 1.3
Interest cost | 1.0 | 1.5 | 1.4
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | 1.5 | 0.8 | 0.9
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Net periodic postretirement cost | 4.0 | 3.5 | 3.6
Settlement charges | 0.1 | 0.0 | 0.0
Total net periodic postretirement cost | 4.1 | 3.5 | 3.6
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial loss (gain) | 3.2 | 10.3 | 0.8
Prior service cost | 0.0 | 0.0 | (0.1)
Amortization of net actuarial loss | (1.6) | (0.8) | (0.9)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign currency translation | 2.9 | (0.3) | (1.0)
Total change recognized in other comprehensive income | 4.5 | 9.2 | (1.2)
Total impact from net periodic postretirement cost and changes in other comprehensive income | $ 8.6 | $ 12.7 | $ 2.4

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