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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, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Net periodic postretirement cost |  |  |
Service cost | $ 2.1 | $ 2.6 |
Interest cost | 16.6 | 16.0 |
Other Postretirement Benefits Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.7 | 0.9 | $ 0.8
Interest cost | 4.0 | 4.5 | 4.4
Expected return on plan assets | (0.2) | (0.1) | (0.3)
Amortization of net actuarial loss | 2.3 | 4.0 | 4.4
Amortization of prior service cost | (5.1) | (5.3) | (5.8)
Total net periodic postretirement cost | 1.7 | 4.0 | 3.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | 3.4 | (15.6) | 1.0
Prior service cost | 1.7 | 0.0 | 0.5
Amortization of net actuarial loss | (2.3) | (4.0) | (4.4)
Amortization of prior service cost | 5.1 | 5.3 | 5.8
Total change recognized in other comprehensive income | 7.9 | (14.3) | 2.9
Total impact from net periodic postretirement cost and changes in other comprehensive income | 9.6 | (10.3) | 6.4
Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.4 | 1.7 | 2.9
Interest cost | 12.6 | 11.5 | 12.1
Expected return on plan assets | (14.8) | (15.8) | (15.2)
Amortization of net actuarial loss | 5.1 | 5.8 | 7.6
Amortization of prior service cost | 0.7 | 0.9 | 1.0
Net periodic postretirement cost | 5.0 | 4.1 | 8.4
Curtailment or settlement charges | 0.0 | 1.7 | 3.7
Total net periodic postretirement cost | 5.0 | 5.8 | 12.1
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | 0.1 | 16.2 | (8.2)
Prior service cost | 0.0 | (0.1) | 1.6
Amortization of net actuarial loss | (5.1) | (7.5) | (7.6)
Amortization of prior service cost | (0.7) | (0.9) | (4.7)
Foreign currency translation | (0.3) | (1.0) | 2.9
Total change recognized in other comprehensive income | (6.0) | 6.7 | (16.0)
Total impact from net periodic postretirement cost and changes in other comprehensive income | (1.0) | 12.5 | (3.9)
International Plan [Member] | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.2 | 1.3 | 1.4
Interest cost | 1.5 | 1.4 | 1.6
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | 0.8 | 0.9 | 1.0
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Net periodic postretirement cost | 3.5 | 3.6 | 4.0
Curtailment or settlement charges | 0.0 | 0.0 | 0.0
Total net periodic postretirement cost | 3.5 | 3.6 | 4.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | 10.3 | 0.8 | (0.3)
Prior service cost | 0.0 | (0.1) | 0.0
Amortization of net actuarial loss | (0.8) | (0.9) | (1.0)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign currency translation | (0.3) | (1.0) | 2.9
Total change recognized in other comprehensive income | 9.2 | (1.2) | 1.6
Total impact from net periodic postretirement cost and changes in other comprehensive income | 12.7 | 2.4 | 5.6
United States | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.2 | 0.4 | 1.5
Interest cost | 11.1 | 10.1 | 10.5
Expected return on plan assets | (14.8) | (15.8) | (15.2)
Amortization of net actuarial loss | 4.3 | 4.9 | 6.6
Amortization of prior service cost | 0.7 | 0.9 | 1.0
Net periodic postretirement cost | 1.5 | 0.5 | 4.4
Curtailment or settlement charges | 0.0 | 1.7 | 3.7
Total net periodic postretirement cost | 1.5 | 2.2 | 8.1
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | (10.2) | 15.4 | (7.9)
Prior service cost | 0.0 | 0.0 | 1.6
Amortization of net actuarial loss | (4.3) | (6.6) | (6.6)
Amortization of prior service cost | (0.7) | (0.9) | (4.7)
Foreign currency translation | 0.0 | 0.0 | 0.0
Total change recognized in other comprehensive income | (15.2) | 7.9 | (17.6)
Total impact from net periodic postretirement cost and changes in other comprehensive income | $ (13.7) | $ 10.1 | $ (9.5)

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