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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net periodic postretirement cost |  |  |
Service cost | $ 6.8 | $ 6.3 |
Interest cost | 16.5 | 18.3 |
Other Postretirement Benefits Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 0.8 | 0.9 | $ 0.9
Interest cost | 4.4 | 4.9 | 5.0
Expected return on plan assets | (0.3) | (0.5) | (0.9)
Amortization of net actuarial loss | 4.4 | 4.6 | 4.6
Amortization of prior service cost | (5.8) | (6.5) | (11.0)
Net periodic postretirement cost | 3.5 | 3.4 | (1.4)
Curtailment or settlement charges | 0.0 | 0.0 | (4.2)
Total net periodic postretirement cost | 3.5 | 3.4 | (5.6)
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | 1.0 | (1.9) | 7.7
Prior service cost | 0.5 | 0.0 | 0.0
Amortization of net actuarial (loss) gain | (4.4) | (4.6) | (4.6)
Amortization of prior service cost | 5.8 | 6.5 | 11.0
Acceleration of prior service costs | 0.0 | 0.0 | 6.2
Total change recognized in other comprehensive loss | 2.9 | 0.0 | 20.3
Total impact from net periodic postretirement cost and changes in other comprehensive loss | 6.4 | 3.4 | 14.7
Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 6.0 | 5.4 | 5.0
Interest cost | 12.1 | 13.4 | 14.5
Expected return on plan assets | (18.3) | (20.1) | (20.8)
Amortization of net actuarial loss | 7.6 | 7.8 | 8.5
Amortization of prior service cost | 1.0 | 0.9 | 1.0
Net periodic postretirement cost | 8.4 | 7.4 | 8.2
Curtailment or settlement charges | 3.7 | 12.7 | 0.1
Total net periodic postretirement cost | 12.1 | 20.1 | 8.3
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | (8.2) | 6.1 | 11.0
Prior service cost | 1.6 | 0.4 | 0.0
Amortization of net actuarial (loss) gain | (7.6) | (20.5) | (8.6)
Amortization of prior service cost | (4.7) | (0.9) | (1.0)
Foreign currency translation | 2.9 | (0.5) | (2.5)
Total change recognized in other comprehensive loss | (16.0) | (15.4) | (1.1)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | (3.9) | 4.7 | 7.2
International Plan [Member] | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 1.4 | 1.3 | 1.5
Interest cost | 1.6 | 1.5 | 1.5
Expected return on plan assets | 0.0 | 0.0 | 0.0
Amortization of net actuarial loss | 1.0 | 0.7 | 1.0
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Net periodic postretirement cost | 4.0 | 3.5 | 4.0
Curtailment or settlement charges | 0.0 | 0.0 | 0.1
Total net periodic postretirement cost | 4.0 | 3.5 | 4.1
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | (0.3) | 4.0 | (2.9)
Prior service cost | 0.0 | 0.4 | 0.0
Amortization of net actuarial (loss) gain | (1.0) | (0.7) | (1.1)
Amortization of prior service cost | 0.0 | 0.0 | 0.0
Foreign currency translation | 2.9 | (0.5) | (2.5)
Total change recognized in other comprehensive loss | 1.6 | 3.2 | (6.5)
Total impact from net periodic postretirement cost and changes in other comprehensive loss | 5.6 | 6.7 | (2.4)
U.S. Plan [Member] | Pension Plan [Member] |  |  |
Net periodic postretirement cost |  |  |
Service cost | 4.6 | 4.1 | 3.5
Interest cost | 10.5 | 11.9 | 13.0
Expected return on plan assets | (18.3) | (20.1) | (20.8)
Amortization of net actuarial loss | 6.6 | 7.1 | 7.5
Amortization of prior service cost | 1.0 | 0.9 | 1.0
Net periodic postretirement cost | 4.4 | 3.9 | 4.2
Curtailment or settlement charges | 3.7 | 12.7 | 0.0
Total net periodic postretirement cost | 8.1 | 16.6 | 4.2
Other changes in plan assets and benefit obligations recognized in other comprehensive loss |  |  |
Net actuarial (gain) loss | (7.9) | 2.1 | 13.9
Prior service cost | 1.6 | 0.0 | 0.0
Amortization of net actuarial (loss) gain | (6.6) | (19.8) | (7.5)
Amortization of prior service cost | (4.7) | (0.9) | (1.0)
Foreign currency translation | 0.0 | 0.0 | 0.0
Total change recognized in other comprehensive loss | (17.6) | (18.6) | 5.4
Total impact from net periodic postretirement cost and changes in other comprehensive loss | $ (9.5) | $ (2.0) | $ 9.6

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