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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
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Net periodic postretirement cost |  |  |  |  |  |
Service cost |  | $ 2.1 |  | $ 2.3 |  |
Interest cost |  | 2.8 |  | 10.7 |  |
Pension settlement charges |  | 0.0 |  | 137.0 |  | $ 0.0
Pension Plan [Member] |  |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |  |
Service cost |  | 1.4 |  | 1.5 |  | 1.4
Interest cost |  | 1.0 |  | 7.9 |  | 12.6
Expected return on plan assets |  | 0.0 |  | (7.2) |  | (14.8)
Amortization of net actuarial loss |  | 1.8 |  | 6.3 |  | 5.1
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | 0.7
Net periodic postretirement cost |  | 4.2 |  | 8.5 |  | 5.0
Pension settlement charges |  | (3.4) | [1] | 137.0 | [1] | 0.0
Total net periodic postretirement cost |  | 0.8 |  | 145.5 |  | 5.0
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |  |
Net actuarial (gain) loss |  | (6.4) |  | 37.9 |  | 0.1
Amortization of net actuarial loss |  | (1.8) |  | (143.3) |  | (5.1)
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | (0.7)
Foreign currency translation |  | (2.7) |  | 2.9 |  | (0.3)
Total change recognized in other comprehensive income |  | (10.9) |  | (102.5) |  | (6.0)
Total impact from net periodic postretirement cost and changes in other comprehensive income |  | (10.1) |  | 43.0 |  | (1.0)
Other Postretirement Benefits Plan [Member] |  |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |  |
Service cost |  | 0.7 |  | 0.8 |  | 0.7
Interest cost |  | 1.8 |  | 2.8 |  | 4.0
Expected return on plan assets |  | 0.0 |  | 0.0 |  | (0.2)
Amortization of net actuarial loss |  | 2.6 |  | 2.6 |  | 2.3
Amortization of prior service cost |  | (5.1) |  | (5.1) |  | (5.1)
Total net periodic postretirement cost |  | 0.0 |  | 1.1 |  | 1.7
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |  |
Net actuarial (gain) loss |  | (8.2) |  | 3.9 |  | 3.4
Prior service cost |  | 0.0 |  | 0.0 |  | 1.7
Amortization of net actuarial loss |  | (2.6) |  | (2.6) |  | (2.3)
Amortization of prior service cost |  | 5.1 |  | 5.1 |  | 5.1
Total change recognized in other comprehensive income |  | (5.7) |  | 6.4 |  | 7.9
Total impact from net periodic postretirement cost and changes in other comprehensive income |  | (5.7) |  | 7.5 |  | 9.6
United States | Pension Plan [Member] |  |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |  |
Service cost |  | 0.0 |  | 0.0 |  | 0.2
Interest cost |  | 0.3 |  | 6.9 |  | 11.1
Expected return on plan assets |  | 0.0 |  | (7.2) |  | (14.8)
Amortization of net actuarial loss |  | 0.2 |  | 4.8 |  | 4.3
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | 0.7
Net periodic postretirement cost |  | 0.5 |  | 4.5 |  | 1.5
Pension settlement charges | [1] | (3.4) |  | 136.9 |  |
Total net periodic postretirement cost |  | (2.9) |  | 141.4 |  | 1.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |  |
Net actuarial (gain) loss |  | (0.1) |  | 34.7 |  | (10.2)
Amortization of net actuarial loss |  | (0.2) |  | (141.7) |  | (4.3)
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | (0.7)
Foreign currency translation |  | 0.0 |  | 0.0 |  | 0.0
Total change recognized in other comprehensive income |  | (0.3) |  | (107.0) |  | (15.2)
Total impact from net periodic postretirement cost and changes in other comprehensive income |  | (3.2) |  | 34.4 |  | (13.7)
International Plan [Member] | Pension Plan [Member] |  |  |  |  |  |
Net periodic postretirement cost |  |  |  |  |  |
Service cost |  | 1.4 |  | 1.5 |  | 1.2
Interest cost |  | 0.7 |  | 1.0 |  | 1.5
Expected return on plan assets |  | 0.0 |  | 0.0 |  | 0.0
Amortization of net actuarial loss |  | 1.6 |  | 1.5 |  | 0.8
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | 0.0
Net periodic postretirement cost |  | 3.7 |  | 4.0 |  | 3.5
Pension settlement charges |  | 0.0 |  | 0.1 |  | 0.0
Total net periodic postretirement cost |  | 3.7 |  | 4.1 |  | 3.5
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |  |  |  |
Net actuarial (gain) loss |  | (6.3) |  | 3.2 |  | 10.3
Amortization of net actuarial loss |  | (1.6) |  | (1.6) |  | (0.8)
Amortization of prior service cost |  | 0.0 |  | 0.0 |  | 0.0
Foreign currency translation |  | (2.7) |  | 2.9 |  | (0.3)
Total change recognized in other comprehensive income |  | (10.6) |  | 4.5 |  | 9.2
Total impact from net periodic postretirement cost and changes in other comprehensive income |  | $ (6.9) |  | $ 8.6 |  | $ 12.7
[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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